Philips 74HCT238
The 74HC/HCT238 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. The 74HC/HCT238 decoders accept three binary weighted address inputs (A0, A1, A2) and when enabled, QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns 74HC/HCT238 provide 8 mutually exclusive active HIGH outputs (Y0 to Y7).| Part No. | 74HCT238 |
|---|---|
| Datasheet | 74HCT238 Download |
| Manufacturer |  Philips |
| Description | 3-to-8 line decoder/demultiplexer |
| Buy | Stock & Price |
FEATURES
● Demultiplexing capability● Multiple input enable for easy expansion
● Ideal for memory chip select decoding
● Active HIGH mutually exclusive outputs
● Output capability: standard
● ICC category: MSI
GENERAL DESCRIPTION
7A. The “238” features three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3). Every output will be LOW unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the “238” to a 1-of-32 (5 lines to 32 lines) decoder with just four “238” ICs and one inverter. The “238” can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes. Unused enable inputs must be permanently tied to their appropriate active HIGH or LOW state. The “238” is identical to the “138” but has non-inverting outputs. TYPICAL SYMBOL tPHL/ tPLH PARAMETER propagation delay An to Yn E3 to Yn En to Yn CI CPD Notes 1. CPD is used to determine th...
