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IDT74LVC257A 3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER WITH 3-STATE OUTPUTS, 5V TOLERANT I/O
* 0.5 MICRON CMOS Technology * 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 * CMOS power levels (0.4 W typ. static) * Rail-to-Rail output swing for increased noise margin * All inputs, outputs, and I/Os are 5V tolerant * Supports hot insertion * Available in QSOP, SOIC, SSOP, and TSSOP packages
IDT74LVC257A
FEATURES:
DESCRIPTION:
DRIVE FEATURES: APPLICATIONS:
The LVC257A is built using advanced dual metal CMOS technology and is designed to multiplex signals from 4-bit data sources to 4-output data lines in busorganized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a high logic level. The LVC257A has been designed with a 24mA output driver. This driver is capable of driving a moderate to heavy load while maintaining speed performance. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resisitor; the minimum value of the resistor is determined by the current-sinking capability of the driver. Inputs can be driven from either 3.3V or 5V devices. This feature allows the use of this device as a translator in a mixed 3.3V/5V supply system.
* High Output Drivers: 24mA * Reduced system switching noise
* 5V and 3.3V mixed voltage systems * Data communication and telecommunication systems
FUNCTIONAL BLOCK DIAGRAM
OE
15
A/B
1
1A
2 4 1Y 3
1B
2A
5 7 2Y 6
2B
3A
11 9 3Y
3B
10
4A
14 12 4Y 13
4B
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
(c)2000 Integrated Device Technology, Inc.
FEBRUARY 2000
DSC-4741/1
IDT74LVC257A 3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
A/B
1A 1B 1Y 2A 2B 2Y
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Terminal Voltage with Respect to GND Storage Temperature DC Output Current Continuous Clamp Current, VI < 0 or VO < 0 Continuous Current through each VCC or GND Max -0.5 to +6.5 -65 to +150 -50 to +50 -50 100 Unit V C mA mA mA
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC OE
4A 4B 4Y 3A 3B 3Y
VTERM TSTG IOUT IIK IOK ICC ISS
GND
NOTE: 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.
QSOP/ SOIC/ SSOP/ TSSOP TOP VIEW
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. 4.5 5.5 6.5 Max. 6 8 8 Unit pF pF pF
NOTE: 1. As applicable to the device type.
PIN DESCRIPTION
Pin Names A/B OE xY xA, xB Select Input Output-Enable Input (Active LOW) 3-State Outputs Data Inputs Description
FUNCTION TABLE(1)
Inputs OE H L L L L A/B X L L H H xA X L H X X xB X X X L H Outputs xY Z L H L H
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High-Impedance
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IDT74LVC257A 3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
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 IOFF VIK VH ICCL ICCH ICCZ ICC High Impedance Output Current (3-State Output pins) Input/Output Power Off Leakage Clamp Diode Voltage Input Hysteresis Quiescent Power Supply Current VCC = 0V, VIN or VO 5.5V VCC = 2.3V, IIN = -18mA VCC = 3.3V VCC = 3.6V, VIN = GND or VCC -- -- -- -- -- -0.7 100 -- 50 -1.2 -- 10 A V mV A VCC = 3.6V VO = 0 to 5.5V -- -- 10 A Parameter Input HIGH Voltage Level Input LOW Voltage Level Input Leakage Current 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 VI = 0 to 5.5V Test Conditions Min. 1.7 2 -- -- -- Typ.(1) -- -- -- -- -- Max. -- -- 0.7 0.8 5 A V Unit V
Quiescent Power Supply Current Variation
One input at VCC - 0.6V, other inputs at VCC or GND
--
--
500
A
NOTE: 1. Typical values are at VCC = 3.3V, +25C ambient.
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 2.2 -- -- -- -- -- 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.
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IDT74LVC257A 3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, VCC = 3.3V 0.3V, TA = 25C
Symbol CPD Parameter Power Dissipation Capacitance per Flip-Flop Test Conditions CL = 0pF, f = 10Mhz Typical 15.5 Unit pF
SWITCHING CHARACTERISTICS(1)
VCC = 2.7V Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tSK(o) Parameter Propagation Delay xA or xB to xY Propagation Delay A/B to xY Output Enable Time OE to xY Output Disable Time OE to xY Output Skew(2) -- -- -- 1 ns -- 4.7 1 4.3 ns -- 6.7 1 5.6 ns Min. -- -- Max. 5.4 7.5 VCC = 3.3V 0.3V Min. 1 1 Max. 4.6 6.4 Unit ns 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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IDT74LVC257A 3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC(1)= 2.5V0.2V 2 x Vcc Vcc Vcc / 2 150 150 30 VCC(2)= 3.3V0.3V & 2.7V 6 2.7 1.5 300 300 50 Unit V V V mV mV pF
SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL
VIH VT 0V VOH VT VOL VIH VT 0V
Propagation Delay
LVC QUAD Link
VCC 500 Pulse Generator
(1, 2)
VLOAD Open GND 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
LVC QUAD Link
VIN D.U.T. RT
VOUT
500 CL
LVC QUAD 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 10MHz; tF 2ns; tR 2ns. 2. Pulse Generator for All Pulses: Rate 10MHz; tF 2.5ns; tR 2.5ns.
NOTE: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Enable and Disable Times
SWITCH POSITION
Test Open Drain Disable Low Enable Low Disable High Enable High All Other Tests Switch VLOAD GND Open
DATA INPUT TIMING INPUT SYNCHRONOUS CONTROL ASYNCHRONOUS CONTROL
tSU
tH
tREM
INPUT
tPLH1
tPHL1
VIH VT 0V VOH VT VOL VOH VT VOL
tSU
tH
VIH VT 0V VIH VT 0V VIH VT 0V VIH VT 0V
LVC QUAD Link
Set-up, Hold, and Release Times
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE VT
LVC QUAD Link
OUTPUT 1
tSK (x)
tSK (x)
VT
OUTPUT 2 tPLH2 tPHL2
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
LVC QUAD Link
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.
Pulse Width
5
IDT74LVC257A 3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
LVC XX IDT XX XXXX Device Type Package Temp. Range
Q DC PY PG 257A 74
Quarter Size Outline Package Small Outline IC Shrink Small Outline Package Thin Shrink Small Outline Package Quadruple 2-Line to 1-Line Data Selector/Multiplexer with 3-State Outputs, 24mA -40C to +85C
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
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for Tech Support: logichelp@idt.com (408) 654-6459
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