Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Buffer, driver SMD 74 HCT 125 SOIC 14

M54/74HCT125

M54/74HCT126

October 1993

QUAD BUS BUFFERS (3-STATE)

B1R

(Plastic Package)

ORDER CODES :

M54HCTXXXF1R M74HCTXXXM1R

M74HCTXXXB1R M74HCTXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

NC =

No Internal

Connection

INPUT AND OUTPUT EQUIVALENT CIRCUIT

DESCRIPTION

.HIGH SPEED

= 12 ns (TYP.) AT V

=5V

.LOW POWER DISSIPATION

=4µA (MAX.) AT 25 °C

.OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

.BALANCEDPROPAGATION DELAYS

PLH

PHL

.SYMMETRICAL OUTPUT IMPEDANCE

= I

 = 6 mA (MIN.)

.COMPATIBLE WITH TTL OUTPUTS

= 2V (MIN.) V

= 0.8V (MAX)

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS125/126

The M54/74HCT125/126 are high speed CMOS

QUAD BUS BUFFER (3-STATE) FABRICATED IN

SILICON GATE C

MOS technology. They have the

same high speed performance of LSTTL combined

with true CMOS low power consumption. These de-

vices require the same 3-STATE control input G to

be taken high to make the output go into thehigh im-

pedance state.This integrated circuit has input and

output characteristics that are fully compatible with

54/74 LSTTL logic families. M54/74HCT devices

are designed to directly interface HSC

MOS sys-

tems with TTL and NMOS components. They are

also plug in replacements for LSTTL devices giving

a reduction of power consumption. All inputs are

equipped with protection circuits against static dis-

charge and transient excess voltage.

HCT125

HCT126

1/10

Summary of content (10 pages)

PAGE 1
M54/74HCT125 M54/74HCT126 QUAD BUS BUFFERS (3-STATE) . . . . . . . HIGH SPEED tPD = 12 ns (TYP.) AT VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (MAX.) AT 25 °C OUTPUT DRIVE CAPABILITY 15 LSTTL LOADS BALANCED PROPAGATION DELAYS tPLH = tPHL SYMMETRICAL OUTPUT IMPEDANCE IOL = IOH = 6 mA (MIN.) COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.
PAGE 2
M54/M74HCT125/126 CHIP CARRIER HCT125 HCT126 TRUTH TABLE (HCT125) TRUTH TABLE (HCT126) A G Y A G Y X L H L Z L X L L H Z L H L H H H H PIN DESCRIPTION (HCT125) PIN DESCRIPTION (HCT126) PIN No 1, 4, 10, 13 SYMBOL G1 to G4 NAME AND FUNCTION Output Enable Input PIN No 1, 4, 10, 13 SYMBOL G1 to G4 NAME AND FUNCTION Output Enable Input 2, 5, 9, 12 A1 to A4 Data Inputs 2, 5, 9, 12 A1 to A4 Data Inputs 3, 6, 8, 11 7 Y1 to Y4 GND Data Outputs Ground (0V) 3, 6, 8, 11 7 Y1 to Y
PAGE 3
M54/M74HCT125/126 CIRCUIT DIAGRAM HCT125 HCT126 ABSOLUTE MAXIMUM RATINGS Symbol Value Unit VCC VI Supply Voltage DC Input Voltage -0.5 to +7 -0.5 to VCC + 0.5 V V VO DC Output Voltage -0.5 to VCC + 0.
PAGE 4
M54/M74HCT125/126 DC SPECIFICATIONS Test Conditions Symbol Parameter VCC (V) VIH High Level Input Voltage 4.5 to 5.5 V IL Low Level Input Voltage 4.5 to 5.5 V OH High Level Output Voltage VOL II ICC IOZ ∆ICC Low Level Output Voltage Input Leakage Current Quiescent Supply Current 3 State Output Off State Current Additional worst case supply current Value TA = 25 oC 54HC and 74HC Min. Typ. Max. 2.0 -40 to 85 oC -55 to 125 oC 74HC 54HC Min. Max. Min. Max. 2.0 0.8 4.
PAGE 5
M54/M74HCT125/126 TEST CIRCUIT ICC (Opr.
PAGE 6
M54/M74HCT125/126 Plastic DIP14 MECHANICAL DATA mm DIM. MIN. a1 0.51 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.055 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 15.24 0.600 F 7.1 0.280 I 5.1 0.201 L Z 3.3 1.27 0.130 2.54 0.050 0.
PAGE 7
M54/M74HCT125/126 Ceramic DIP14/1 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 20 0.787 B 7.0 0.276 D E 3.3 0.130 0.38 e3 0.015 15.24 0.600 F 2.29 2.79 0.090 0.110 G 0.4 0.55 0.016 0.022 H 1.17 1.52 0.046 0.060 L 0.22 0.31 0.009 0.012 M 1.52 2.54 0.060 0.100 N P Q 10.3 7.8 8.05 5.08 0.406 0.307 0.317 0.
PAGE 8
M54/M74HCT125/126 SO14 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.003 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 8.55 E 5.8 8.75 0.336 6.2 0.228 0.344 0.244 e 1.27 0.050 e3 7.62 0.300 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.68 0.026 8° (max.
PAGE 9
M54/M74HCT125/126 PLCC20 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 9.78 10.03 0.385 0.395 B 8.89 9.04 0.350 0.356 D 4.2 4.57 0.165 0.180 d1 2.54 0.100 d2 0.56 0.022 E 7.37 8.38 0.290 0.330 e 1.27 0.050 e3 5.08 0.200 F 0.38 0.015 G 0.101 0.004 M 1.27 0.050 M1 1.14 0.
PAGE 10
M54/M74HCT125/126 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice.