Datasheet

ManualsBrandsUnbranded ManualsLogic ICsLogic IC - Multiplexer SMD 74 HCT 257 Multiplexer Single supply SO 16

M54/M74HCT257

M54/M74HCT258

February 1993

HCT258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)

HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

B1R

(Plastic Package)

ORDER CODES :

M54HCTXXXF1R M74HCTXXXM1R

M74HCTXXXB1R M74HCTXXXC1R

F1R

(Ceramic Package)

M1R

(Micro Package)

C1R

(Chip Carrier)

PIN CONNECTIONS (top view)

.HIGH SPEED

= 16 ns (TYP.) at V

=5V

.LOW POWER DISSIPATION

=4µA (MAX.) at T

=25°C

.COMPATIBLE WITH TTL OUTPUTS

= 2V (MIN.) V

= 0.8V (MAX)

.OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

.SYMMETRICAL OUTPUT IMPEDANCE

IOH =I

= 6 mA (MIN.)

.BALANCEDPROPAGATION DELAYS

PLH

PHL

.PIN AND FUNCTION COMPATIBLE

WITH 54/74LS257/258

DESCRIPTION

The M54/74HCT257 and the M54/74HCT258 are

high speed CMOS MULTIPLEXERs fabricated with

silicon gate C

MOS technology.

They have the same high speed performance of

LSTTL combined with true CMOS low power con-

sumption.

These IC’s are composed of an independent 2-

channelmultiplexer with commonSELECT and EN-

ABLE INPUT.

The M54/74HCT258 is an inverting multiplexer

while the M54/74HCT257 is a non-inverting multi-

plexer. When the ENABLE INPUT is held ”High”,

outputs of both IC’sbecome high-impedance state.

If SELECTINPUTis held ”Low”, ”A” datais selected,

when SELECT INPUT is high ”H”, ”B” data is

chosen.

All inputs are equipped with protection circuits

against static discharge and transient excess volt-

age.

This integrated circuit has input and output charac-

teristics 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 replace-

HCT257

HCT258

1/12

Summary of content (12 pages)

PAGE 1
M54/M74HCT257 M54/M74HCT258 HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) HCT258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING) . . . . . . . HIGH SPEED tPD = 16 ns (TYP.) at VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (MAX.) at TA = 25 °C COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.8V (MAX) OUTPUT DRIVE CAPABILITY 15 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE IOH = IOL = 6 mA (MIN.
PAGE 2
M54/M74HCT257/258 INPUT AND OUTPUT EQUIVALENT CIRCUIT CHIP CARRIER HCT257 HCT258 NC = No Internal Connection PIN DESCRIPTION (HCT257) PIN No SYMBOL NAME AND FUNCTION 1 SELECT Common Data Select Input 2, 5, 14, 11 3, 6, 13, 10 1A to 4A 1B to 4B 4, 7, 12, 9 1Y to 4Y 15 OE 8 16 GND V CC 2/12 PIN DESCRIPTION (HCT258) PIN No SYMBOL 1 SELECT Common Data Select Input NAME AND FUNCTION Data Input From Source A Data Inputs from Source B 2, 5, 14, 11 3, 6, 13, 10 1A to 4A 1B to 4B Data Inp
PAGE 3
M54/M74HCT257/258 IEC LOGIC SYMBOL HCT257 HCT258 HCT257 HCT258 LOGIC DIAGRAM TRUTH TABLE INPUTS OUTPUTS OE H SELECT X A X B X Y (257) Z Y (258) Z L L L X L H L L L H H X X L H L L H L H X H H L X = DON’T CARE Z = HIGH IMPEDANCE 3/12
PAGE 4
M54/M74HCT257/258 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/M74HCT257/258 DC SPECIFICATIONS Test Conditions Symbol Parameter TA = 25 oC 54HC and 74HC 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 Min. 4.5 4.5 VI = IO= 20 µA VIH or IO= 4.0 mA V IL 3-State Output Off State Current 5.5 Input Leakage Current ICC ∆ICC IOZ II Low Level Output Voltage Max. Min. Max. 2.0 0.8 VI = IO=-20 µA VIH or IO=-4.0 mA V IL VOL Typ. 2.
PAGE 6
M54/M74HCT257/258 AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns) Test Conditions o Symbol Parameter VCC (V) tTLH tTHL tPLH tPHL Output Transition Time Propagation Delay Time (A, B - Y) 4.5 tPLH tPHL 4.5 tPZL tPZH Propagation Delay Time (SELECT - Y) Output Enable Time 4.5 tPLZ tPHZ CIN Output Disable Time Input Capacitance 4.5 COUT Output Capacitance Power Dissipation Capacitance CPD (*) 4.5 TA = 25 C 54HC and 74HC Min. Typ. 7 Max.
PAGE 7
M54/M74HCT257/258 SWITCHING CHARACTERISTICS TEST WAVEFORM TEST CIRCUIT ICC (Opr.) C PD CALCULATION CPD is to be calculated with the following formula by using the measured value of ICC (opr.) in the test circuit opposite. ICC ( opr) CPD = fIN × VCC INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERSISTICS TESt.
PAGE 8
M54/M74HCT257/258 Plastic DIP16 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 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 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.
PAGE 9
M54/M74HCT257/258 Ceramic DIP16/1 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 20 0.787 B 7 0.276 D E 3.3 0.130 0.38 e3 0.015 17.78 0.700 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 0.51 1.27 0.020 0.050 N P Q 10.3 7.8 8.05 5.08 0.406 0.307 0.317 0.
PAGE 10
M54/M74HCT257/258 SO16 (Narrow) MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 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 9.8 E 5.8 10 0.385 6.2 0.228 0.393 0.244 e 1.27 0.050 e3 8.89 0.350 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 0.62 0.024 8° (max.
PAGE 11
M54/M74HCT257/258 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/M74HCT257/258 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.