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IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER WITH 3-STATE OUTPUTS AND BUS-HOLD
* 0.5 MICRON CMOS Technology * Typical tSK(o) (Output Skew) < 250ps * ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) * VCC = 3.3V 0.3V, Normal Range * VCC = 2.7V to 3.6V, Extended Range * VCC = 2.5V 0.2V * CMOS power levels (0.4 W typ. static) * Rail-to-Rail output swing for increased noise margin * Available in SSOP, TSSOP, and TVSOP packages
IDT74ALVCH16271
FEATURES:
DRIVE FEATURES:
* High Output Drivers: 24mA * Suitable for heavy loads
APPLICATIONS:
* 3.3V high speed systems * 3.3V and lower voltage computing systems
The ALVCH16271 is intended for applications in which two separate data paths must be multiplexed onto, or demultiplexed from, a single data path. This device is particularly suitable as an interface between conventional DRAMs and high-speed microprocessors. A data is stored in the internal A-to-B registers on the low-to-high transition of the clock (CLK) input, provided that the clock-enable (CLKENA) inputs are low. Proper control of these inputs allows two sequential 12-bit words to be presented as a 24-bit word on the B port. Transparent latches in the B-to-A path allow asynchronous operation to maximize memory access throughput. These latches transfer data when the latch-enable (LE) inputs are low. The select (SEL) line selects 1B or 2B data for the A inputs. Data flow is controlled by the activelow output enables (OEA, OEB). The ALVCH16271 has been designed with a 24mA output driver. This driver is capable of driving a moderate to heavy load while maintaining speed performance. The ALVCH16271 has "bus-hold" which retains the inputs' last state whenever the input goes to a high impedance. This prevents floating inputs and eliminates the need for pull-up/down resistors.
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
CLK
29
LE1B
2
27
LE2B
30
CLKENA1
55
CLKENA2
OEB SEL
56
28
OEA
1
LE 1D
23
1B 1
0 LE A1
8
1
1D
6
2B 1
CE C1 1D
CE C1 1D 1 of 12 Channels
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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(c) 1999 Integrated Device Technology, Inc.
MARCH 1999
DSC-4476/2
IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
OEA LE1B
2B3
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max VTERM(2) Terminal Voltage with Respect to GND Terminal Voltage with Respect to GND Storage Temperature DC Output Current Continuous Clamp Current, VI < 0 or VI > VCC Continuous Clamp Current, VO < 0 Continuous Current through each VCC or GND -0.5 to +4.6 -0.5 to VCC+0.5 -65 to +150 -50 to +50 50 -50 100
OEB CLKENA2
2B4
Unit V V C mA mA mA mA
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
VTERM(3) TSTG IOUT IIK IOK ICC ISS
GND
2B2 2B1
GND
2B5 2B6
VCC A1 A2 A3 GND A4 A5 A6 A7 A8 A9 GND A10 A11 A12 VCC
1B1 1B2
VCC
2B7 2B8 2B9
GND
2B10 2B11 2B12 1B12 1B11 1B10
NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. VCC terminals. 3. All terminals except VCC.
CAPACITANCE (TA = +25C, F = 1.0MHz)
Symbol CIN COUT CI/O Parameter(1) Input Capacitance Output Capacitance I/O Port Capacitance Conditions VIN = 0V VOUT = 0V VIN = 0V Typ. 5 7 7 Max. 7 9 9 Unit pF pF pF
GND
1B9 1B8 1B7
NOTE: 1. As applicable to the device type.
VCC
1B6 1B5
FUNCTION TABLES(1)
OUTPUT ENABLE
Inputs OEA H H L L OEB H L H L Ax Z Z Active Active Outputs
1Bx, 2Bx
GND
1B3
GND
1B4
Z Active Z Active
LE2B SEL
CLKENA1 CLK
SSOP/ TSSOP/ TVSOP TOP VIEW
A-TO-B STORAGE (OEB = L )
Inputs Outputs CLK X Ax X L H L H
1Bx 1B0
(2)
B-TO-A STORAGE (OEA = L)
Inputs LE1B H H L L X X LE2B H H X X L L SEL X X H H L L
1Bx 2Bx
CLKENA1 Outputs Ax A0(2) A0(2) L H L H H L L X X
CLKENA2 H X X L L
2Bx 2B0(2)
L H X X
X X L H
X X L H X X
X X X X L H
NOTES: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance = LOW-to-HIGH transition 2. Output level before the indicated steady-state input conditions were established.
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IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
PIN DESCRIPTION
Pin Names Ax(1:12) 1Bx(1:12) 2Bx(1:12) CLK CLKENA1 CLKENA2 LE1B LE2B SEL OEA OEB I/O I/O I/O I/O I I I I I I I I Description Bidirectional Data Port A. Usually connected to the CPU's Address/Data bus.(1) Bidirectional Data Port 1B. Usually connected to the even path or even bank of memory.(1) Bidirectional Data Port 2B. Usually connected to the odd path or odd bank of memory.(1) Clock Input Clock Enable Input for the A-1B Register. If CLKENA1 is LOW during the rising edge of CLK, data will be clocked into register A-1B (Active LOW). Clock Enable Input for the A-2B Register. If CLKENA2 is LOW during the rising edge of CLK, data will be clocked into register A-2B (Active LOW). Latch Enable Input for the 1B-A latch Latch Enable Input for the 2B-A latch 1B or 2B Port Selection. When HIGH, SEL enables data transfer from 1B Port to A Port. When LOW, SEL enables data transfer from 2B Port to A Port (Active LOW). Output Enable for A Port (Active LOW) Output Enable for B Port (Active LOW)
NOTE: 1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Operating Condition: TA = -40C to +85C
Symbol VIH VIL IIH IIL IOZH IOZL VIK VH ICCL ICCH ICCZ ICC Parameter Input HIGH Voltage Level Input LOW Voltage Level Input HIGH Current Input LOW Current High Impedance Output Current (3-State Output pins) Clamp Diode Voltage Input Hysteresis Quiescent Power Supply Current VCC = 2.3V, IIN = -18mA VCC = 3.3V VCC = 3.6V VIN = GND or VCC One input at VCC - 0.6V, other inputs at VCC or GND VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 3.6V VCC = 3.6V VCC = 3.6V VI = VCC VI = GND VO = VCC VO = GND Test Conditions Min. 1.7 2 -- -- -- -- -- -- -- -- -- Typ.(1) -- -- -- -- -- -- -- -- -0.7 100 0.1 Max. -- -- 0.7 0.8 5 5 10 10 -1.2 -- 40 V mV A A A A V Unit V
Quiescent Power Supply Current Variation
--
--
750
A
NOTE: 1. Typical values are at VCC = 3.3V, +25C ambient.
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IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
BUS-HOLD CHARACTERISTICS
Symbol IBHH IBHL IBHH IBHL IBHHO IBHLO
NOTES: 1. Pins with Bus-Hold are identified in the pin description. 2. Typical values are at VCC = 3.3V, +25C ambient.
Parameter(1) Bus-Hold Input Sustain Current Bus-Hold Input Sustain Current Bus-Hold Input Overdrive Current VCC = 3V VCC = 2.3V VCC = 3.6V
Test Conditions VI = 2V VI = 0.8V VI = 1.7V VI = 0.7V VI = 0 to 3.6V
Min. - 75 75 - 45 45 --
Typ.(2) -- -- -- -- --
Max. -- -- -- -- 500
Unit A A A
OUTPUT DRIVE CHARACTERISTICS
Symbol VOH Parameter Output HIGH Voltage VCC = 2.3V VCC = 2.3V VCC = 2.7V VCC = 3V VCC = 3V VOL Output LOW Voltage VCC = 2.3V to 3.6V VCC = 2.3V VCC = 2.7V VCC = 3V IOH = - 24mA IOL = 0.1mA IOL = 6mA IOL = 12mA IOL = 12mA IOL = 24mA Test Conditions(1) VCC = 2.3V to 3.6V IOH = - 0.1mA IOH = - 6mA IOH = - 12mA Min. VCC - 0.2 2 1.7 2.2 2.4 2 -- -- -- -- -- Max. -- -- -- -- -- -- 0.2 0.4 0.7 0.4 0.55 V Unit V
NOTE: 1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range. TA = - 40C to + 85C.
OPERATING CHARACTERISTICS, TA = 25C
VCC = 2.5V 0.2V Symbol outputs enabled CPD Power Dissipation Capacitance Ax to xBx, outputs disabled Power Dissipation Capacitance xBx to Ax, outputs enabled Power Dissipation Capacitance xBx to Ax, outputs disabled 11 13 39 43 CL = 0pF, f = 10Mhz 61 76 pF Parameter Power Dissipation Capacitance Ax to xBx, Test Conditions Typical 92 VCC = 3.3V 0.3V Typical 105 Unit
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IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS(1)
VCC = 2.5V 0.2V Symbol fMAX tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tSU tSU tSU tH tH tH tW tW tSK(O) Propagation Delay CLK to xBx Propagation Delay xBx to Ax Propagation Delay LE to Ax Propagation Delay SEL to Ax Output Enable Time OEB to Ax or OEB to xBx Output Disable Time OEB to Ax or OEB to xBx Set-up Time, Ax data before CLK Set-up Time, Bx data before LE Set-up Time, CLKEN before CLK Hold Time, Ax data after CLK Hold Time, Bx data after LE Hold Time, CLKEN after CLK Pulse Width, CLK HIGH or LOW Pulse Width, LExB LOW Output Skew(2) 2.6 1.7 1.6 0.6 0.9 1 3.3 3.3 -- -- -- -- -- -- -- -- -- -- 2.1 1.5 1.3 0.6 0.9 0.9 3.3 3.3 -- -- -- -- -- -- -- -- -- -- 1.7 1.3 1 0.7 1.1 0.9 3.3 3.3 -- -- -- -- -- -- -- -- -- 500 ns ns ns ns ns ns ns ns ps 1.4 5.4 -- 4.6 1.7 4.2 ns 1 6 -- 6.1 1 5.1 ns 1.1 6.4 -- 6.2 1.3 5.2 ns 1 6 -- 5.9 1.4 4.8 ns 1 5.3 -- 4.7 1.4 4 ns Parameter Min. 130 1 Max. -- 6.2 VCC = 2.7V Min. 130 -- Max. -- 5 VCC = 3.3V 0.3V Min. 130 1 Max. -- 4.3 Unit MHz ns
NOTES: 1. See TEST CIRCUITS AND WAVEFORMS. TA = - 40C to + 85C. 2. Skew between any two outputs of the same package and switching in the same direction.
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IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
VIH VT 0V VOH VT VOL VIH VT 0V
ALVC Link
TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC(1)= 3.3V0.3V VCC(1)= 2.7V 6 2.7 1.5 300 300 50
VCC 500 Pulse Generator
(1, 2)
SAME PHASE INPUT TRANSITION
VCC(2)= 2.5V0.2V 2 x Vcc Vcc Vcc / 2 150 150 30
Unit V V V mV mV pF
VLOAD Open GND
tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION
tPHL
6 2.7 1.5 300 300 50
tPHL
Propagation Delay
ENABLE CONTROL INPUT tPZL OUTPUT SWITCH NORMALLY CLOSED LOW tPZH OUTPUT SWITCH NORMALLY OPEN HIGH VLOAD/2 VT tPHZ VT 0V tPLZ DISABLE VIH VT 0V VLOAD/2 VLZ VOL VOH VHZ 0V
ALVC Link
VIN D.U.T.
VOUT
RT
500 CL
ALVC Link
Test Circuit for All Outputs
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. NOTES: 1. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2ns; tR 2ns.
SWITCH POSITION
Test Open Drain Disable Low Enable Low Disable High Enable High All Other Tests Switch VLOAD GND Open
VIH INPUT VT 0V VOH OUTPUT 1 VT VOL VOH OUTPUT 2 tPLH2 tPHL2
ALVC Link
NOTE: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. VIH DATA VT INPUT 0V tSU tH VIH TIMING VT INPUT 0V tREM VIH ASYNCHRONOUS VT CONTROL 0V VIH SYNCHRONOUS VT CONTROL tSU 0V tH
ALVC Link
Enable and Disable Times
Set-up, Hold, and Release Times
tPLH1
tPHL1
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
VT
tSK (x)
tSK (x)
VT VOL
VT
ALVC Link
Pulse Width
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
Output Skew - tSK(X)
NOTES: 1. For tSK(o) OUTPUT1 and OUTPUT2 are any two outputs. 2. For tSK(b) OUTPUT1 and OUTPUT2 are in the same bank.
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IDT74ALVCH16271 3.3V CMOS 12-BIT TO 24-BIT MULTIPLEXED BUS EXCHANGER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
ALVC X IDT XX Bus-Hold Temp. Range XX Family XX XXX Device Type Package
PV PA PF 271 16 H 74
Shrink Small Outline Package Thin Shrink Small Outline Package Thin Very Small Outline Package 12-Bit to 24-Bit Multiplexed Bus Exchanger with 3-State Outputs Double-Density, 24mA Bus-Hold - 40C to +85C
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