Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Buffer, driver DIP 20

M54HCT240/241/244

M74HCT240/241/244

September 1993

HCT240: INVERTED - HCT241/244 NON INVERTED

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS

B1R

(Plastic Package)

ORDER CODES :

M54HCTXXXF1R M74HCTXXXM1R

M74HCTXXXB1R M74HCTXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTION (top view)

.HIGH SPEED

= 13 ns (TYP.) at V

=5V

.LOW POWER DISSIPATION

=4µA (MAX.) at T

=25

.COMPATIBLE WITH TTL OUTPUTS

= 2V (MIN.) V

= 0.8V (MAX)

.OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

.SYMMETRICAL OUTPUT IMPEDANCE

|=I

= 6 mA (MIN)

.BALANCED PROPAGATION DELAYS

PLH

PHL

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS240/241/244

DESCRIPTION

The M54/74HCT240, HCT241 and HCT244 are

high speed CMOS OCTAL BUS BUFFERs

fabricated in silicon gate C

MOS technology.

They have the same high speed performance of

LSTTL combined with true CMOS low power

consumption. The designer has a choise of select

combination of inverting and non-inverting outputs,

symmetrical G (active low output control) input, and

complementary G and G inputs. Each control input

governs four BUS BUFFERs.

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 systems

with TTL and NMOS components.

They are also plug in replacements for LSTTL

devices giving a reduction of power consumption.

These devices are designed to be used with 3 state

memory address drivers, etc.

All inputs are equipped with protection circuits

against static discharge and transient excess

voltage.

HCT244HCT241HCT240

1/12

Summary of content (12 pages)

PAGE 1
M54HCT240/241/244 M74HCT240/241/244 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS HCT240: INVERTED - HCT241/244 NON INVERTED . . . . . . . HIGH SPEED tPD = 13 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION o ICC = 4 µA (MAX.) at TA = 25 C COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.
PAGE 2
M54/M74HCT240/241/244 CHIP CARRIER HCT240 HCT241 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION (HCT241) PIN No SYMBOL 1 1G 2, 4, 6, 8 9, 7, 5, 3 1A1 to 1A4 2Y1 to 2Y4 Data Inputs Data Outputs 11, 13, 15, 17 2A1 to 2A4 18, 16, 14, 12 1Y1 to 1Y4 19 10 2G GND 20 V CC 2/12 NAME AND FUNCTION HCT244 PIN DESCRIPTION (HCT240) PIN No 1 SYMBOL 1G 2, 4, 6, 8 1A1 to 1A4 Data Inputs 9, 7, 5, 3 2Y1 to 2Y4 Data Outputs 11, 13, 15, 17 2A1 to 2A4 Data Inputs 18, 16, 14, 12 1Y1 to 1Y4
PAGE 3
M54/M74HCT240/241/244 IEC LOGIC SYMBOLS HCT240 HCT241 HCT244 TRUTH TABLE INPUT OUTPUT G L L G (HCT241) H H An L H Yn (HCT240) H L Yn (HCT241) L H Yn (HCT244) L H H L X Z Z Z X: ”H” or ”L” Z: High impedance CIRCUIT SCHEMATIC (1/8 PACKAGE) HCT240 HCT241/244 3/12
PAGE 4
M54/M74HCT240/241/244 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 5
M54/M74HCT240/241/244 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 ∆ICC Low Level Output Voltage Input Leakage Current Quiescent Supply 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 4.5 VI = IO=-20 µA VIH or IO=-6.0 mA V IL 4.
PAGE 6
M54/M74HCT240/241/244 AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns) Test Conditions o TA = 25 C 54HC and 74HC Symbol Parameter VCC (V) CL (pF) tTLH tTHL tPLH tPHL Output Transition Time Propagation Delay Time 4.5 50 Typ. 7 Max. 12 4.5 50 15 22 tPLH tPHL Propagation Delay Time 4.5 4.5 150 50 21 15 30 25 tPZL tPZH Output Enable Time 4.5 4.5 150 50 RL = 1KΩ 21 17 tPLZ tPHZ Output Disable Time 4.5 4.
PAGE 7
M54/M74HCT240/241/244 SWITCHING CHARACTERISTICS TEST WAVEFORM 7/12
PAGE 8
M54/M74HCT240/241/244 Plastic DIP20 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.254 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.010 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 D 25.4 1.000 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 0.280 I 3.93 0.155 L Z 3.3 0.130 1.34 0.
PAGE 9
M54/M74HCT240/241/244 Ceramic DIP20 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 25 0.984 B 7.8 0.307 D E 3.3 0.5 e3 0.130 1.78 0.020 22.86 0.070 0.900 F 2.29 2.79 0.090 0.110 G 0.4 0.55 0.016 0.022 I 1.27 1.52 0.050 0.060 L 0.22 0.31 0.009 0.012 M 0.51 1.27 0.020 0.050 N1 P Q 4° (min.), 15° (max.) 7.9 8.13 5.71 0.311 0.320 0.
PAGE 10
M54/M74HCT240/241/244 SO20 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 2.65 0.10 0.104 0.20 a2 MAX. 0.004 0.007 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 C 0.50 0.020 c1 45° (typ.) D 12.60 13.00 0.496 0.512 E 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 11.43 0.450 F 7.40 7.60 0.291 0.299 L 0.50 1.27 0.19 0.050 M S 0.75 0.029 8° (max.
PAGE 11
M54/M74HCT240/241/244 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 12
M54/M74HCT240/241/244 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.