Datasheet Details
| Part number | 74ACT257 |
|---|---|
| Manufacturer | STMicroelectronics |
| File Size | 87.80 KB |
| Description | QUAD 2 CHANNEL MULTIPLEXER |
| Datasheet | 74ACT257_STMicroelectronics.pdf |
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Overview: 74ACT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s s s s HIGH SPEED: tPD =5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN), VIL = 0.8V (MAX) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY B M (Plastic Package) (Micro Package) ORDER CODES : 74ACT257B 74ACT257M ENABLE INPUT. The AC257 is a non inverting multiplexer. When the ENABLE INPUT is held ”High” outputs of both IC’s become high impedance state. If SELECT INPUT is held ”Low”, ”A” data is selected, when SELECT INPUT is ”High”, ”B” data is closen. The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
| Part number | 74ACT257 |
|---|---|
| Manufacturer | STMicroelectronics |
| File Size | 87.80 KB |
| Description | QUAD 2 CHANNEL MULTIPLEXER |
| Datasheet | 74ACT257_STMicroelectronics.pdf |
|
|
|
The ACT257 is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.
It is ideal for low power applications mantaining high speed operation similar to equivalent Bipolar Schottky TTL.
These IC’s are composed of an independent 2 channel multiplexer with common SELECT and PIN CONNECTION AND IEC LOGIC SYMBOLS April 1997 1/10 74ACT257 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 5, 14, 11 3, 6, 13, 10 4, 7, 12, 9 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y OE GND VCC NAME AND F UNCTIO N Common Data Select Input Data Input From Source A Data Inputs from Source B 3 State Multiplexer Outputs 3 State Output Enable Inputs (Active LOW) Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT S OE H L L L L X = DON’T CARE Z = HIGH IMPEDANCE OUT PUT S A X L H X X B X X X L H Y Z L H L H SELEC
| Brand Logo | Part Number | Description | Manufacturer |
|---|---|---|---|
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74ACT257 | Quad 2-Input Multiplexer | Fairchild Semiconductor |
| Part Number | Description |
|---|---|
| 74ACT20 | DUAL 4-INPUT NAND GATE |
| 74ACT240 | OCTAL BUS BUFFER |
| 74ACT244 | OCTAL BUS BUFFER |
| 74ACT245 | OCTAL BUS TRANSCEIVER |
| 74ACT273 | OCTAL D-TYPE FLIP-FLOP |
| 74ACT280 | 9 BIT PARITY GENERATOR/CHECKER |
| 74ACT299 | 8 BIT PIPO SHIFT REGISTER |
| 74ACT00 | QUAD 2-INPUT NAND GATE |
| 74ACT02 | QUAD 2-INPUT NOR GATE |
| 74ACT04 | HEX INVERTER |