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(R)
74VHCT125A
QUAD BUS BUFFERS (3-STATE)
PRELIMINARY DATA
s s
s
s
s
s
s
s
s s
HIGH SPEED: tPD = 3.8 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 A (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 125 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.8V (Max.)
M (Micro Package)
T (TSSOP Package)
ORDER CODES : 74VHCT125AM 74VHCT125AT This device requires the 3-STATE control input G to be set high to place the output into the high impedance state. Power down protection is provided on all inputs and outputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage. This device can be used to interface 5V to 3V. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
DESCRIPTION The 74VHCT125A is an advanced high-speed CMOS QUAD BUS BUFFERS fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 1999
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74VHCT125A
INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1, 4, 10, 13 2, 5, 9, 12 3, 6, 8, 11 7 14 SYMBOL 1G to 4G 1A to 4A 1Y to 4Y GND VCC NAME AND FUNCT ION Output Enable Inputs Data Inputs Data Outputs Ground (0V) Positive Supply Voltage
TRUTH TABLE
A X L H
X:"H" or "L" Z:High Impadance
G H L L
Y Z L H
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage DC Output Voltage (see note 1) DC Output Voltage (see note 2) DC Input Diode Current DC Output Diode Current DC Output Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 - 20 20 25 50 -65 to +150 300 Unit V V V V mA mA mA mA
o o
ICC or IGND DC VCC or Ground Current
C C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 1) Output in OFF State 2) High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VI VO VO Top dt/dv Supply Voltage Input Voltage Output Voltage (see note 1) Output Voltage (see note 2) Operating Temperature Input Rise and Fall Time (see note 3) (V CC = 5.0 0.5V) Parameter Valu e 4.5 to 5.5 0 to 5.5 0 to 5.5 0 to VCC -40 to +85 0 to 20 Unit V V V V
o
C
ns/V
1) Output in OFF State 2) High or Low State 3)VIN from0.8V to 2 V
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74VHCT125A
DC SPECIFICATIONS
Symb ol Parameter T est Cond ition s V CC (V) VIH VIL VOH VOL IOZ High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current Additional Worst Case Supply Current Output Leakage Current 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 4.5 to 5.5 I O =-50 A IO=-8 mA I O=50 A IO=8 mA VI = VIH or VIL VO = 0V to 5.5V VI = 5.5V or GND VI = VCC or GND One Input at 3.4V, other input at VCC or GND VOUT = 5.5V 4.4 3.94 0.0 0.1 0.36 0.25 4.5 Min. 2 0.8 4.4 3.8 0.1 0.44 2.5 Typ . Value T A = 25 o C Max. -40 to 85 o C Min . 2 0.8 Max. V V Un it
V V A
II ICC ICC
0 to 5.5 5.5 5.5
0.1 4 1.35
1.0 40 1.5
A A mA
IOPD
0
0.5
5.0
A
AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns)
Symb ol Parameter V CC (V) tPLH tPHL tPLZ tPHZ tPZL tPZH Propagation Delay Time Output Disable Time Output Enable Time 5.0 Test Co ndition CL (pF ) 15 50 15 50 50 RL = 1K RL = 1K RL = 1K RL = 1K RL = 1K Value T A = 25 o C Min. Typ . Max. 3.8 5.5 5.3 3.6 5.1 6.1 7.5 5.1 7.1 8.8 Un it -40 to 85 o C Min . Max. 1.0 6.5 1.0 1.0 1.0 1.0 8.5 6.0 8.0 10.0
5.0(*)
(*)
ns ns ns
5.0(*) 5.0(*) 5.0(*)
(*) Voltage range is 5.0V 0.5V
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74VHCT125A
CAPACITIVE CHARACTERISTICS
Symb ol Parameter Test Co nditions Min. C IN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1) T yp. 4 10 14 Valu e T A = 25 oC Max. 10 -40 to 85 o C Min. Max. 10 pF pF pF Un it
1) CPD isdefined as the value of the IC'sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operting current can be obtained by the following equation. ICC(opr) = CPD * VCC * fIN + ICC/4(per circuit)
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol Parameter T est Cond ition s V CC (V) VOLP VOLV VIHD VILD Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3) 5.0 -0.8 5.0 5.0 C L = 50 pF 2 0.8 Min. Typ . 0.3 -0.3 V Value T A = 25 o C Max. 0.8 -40 to 85 o C Min . Max. Un it
1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n -1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to3.0V. Inputs under test switching: 3.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz.
TEST CIRCUIT
T EST tPLH , tPHL tPZL , tPLZ tPZH , tPHZ
CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 1K orequivalent RT = ZOUT of pulse generator (typically 50)
SW IT CH Open VCC GND
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74VHCT125A
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
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74VHCT125A
SO-14 MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 8.55 5.8 1.27 7.62 4.0 5.3 1.27 0.68 8 (max.) 0.149 0.181 0.019 8.75 6.2 0.35 0.19 0.5 45 (typ.) 0.336 0.228 0.050 0.300 0.157 0.208 0.050 0.026 0.344 0.244 0.1 mm TYP. MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
P013G
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74VHCT125A
TSSOP14 MECHANICAL DATA
mm MIN. A A1 A2 b c D E E1 e K L 0o 0.50 0.05 0.85 0.19 0.09 4.9 6.25 4.3 5 6.4 4.4 0.65 BSC 4o 0.60 8o 0.70 0o 0.020 0.10 0.9 TYP. MAX. 1.1 0.15 0.95 0.30 0.20 5.1 6.5 4.48 0.002 0.335 0.0075 0.0035 0.193 0.246 0.169 0.197 0.252 0.173 0.0256 BSC 4o 0.024 8o 0.028 0.004 0.354 MIN. inch TYP. MAX. 0.433 0.006 0.374 0.0118 0.0079 0.201 0.256 0.176
DIM.
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
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74VHCT125A
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