74F253 Datasheet | Philips Semiconductors

INTEGRATED CIRCUITS 74F253 Dual 4-bit input multiplexer (3-State) Product specification IC15 Data Handbook 1988 Nov 29 Philips Semiconductors Philips Semiconductors Product specification Dual 4-input multiplexer (3-State) Features - 3-State outputs for bus interface and multiplex expansion - mon select inputs - Separate Output Enable Inputs DESCRIPTION The 74F253 has two identical 4-input multiplexers with 3-State outputs which select two bits from four sources selected by mon Select inputs (S0, S1). When the individual Output Enable (OEa, OEb) inputs of the 4-input multiplexers are High, the outputs are forced to a high impedance (Hi-Z) state. The 74F253 is the logic implementation of a 2-pole, 4-position switch; the position of the switch being determined by the logic levels supplied to the two mon Select inputs. To avoid exceeding the maximum current ratings when the outputs of the 3-State devices are tied together, all but one device must be in the high-impedance state. Therefore, only one Output Enable must be active at a time. PIN CONFIGURATION OEa S1 I3a I2a I1a I0a Ya GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC OEb S0 I3b I2b I1b I0b Yb SF00798 TYPE 74F253 TYPICAL PROPAGATION DELAY 7.0ns TYPICAL SUPPLY CURRENT (TOTAL) 12m A ORDERING INFORMATION MERCIAL RANGE DESCRIPTION 16-pin plastic DIP 16-pin plastic SO VCC = 5V ±10%, Tamb = 0°C to +70°C N74F253N N74F253D PKG DWG # SOT38-4 SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS I0a- I3a I0b- I3b S0, S1 OEa OEb Ya, Yb DESCRIPTION Port A data inputs Port B data inputs mon Select inputs Port A Output Enable input (active Low) Port B Output Enable input (active Low) 3-State outputs 74F (U.L.) HIGH/LOW 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 150/40 LOAD VALUE HIGH/LOW 20µA/0.6m A 20µA/0.6m A 20µA/0.6m A 20µA/0.6m A 20µA/0.6m A 3m A/24m A NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6m A in the Low state. LOGIC SYMBOL 6 5 4 3 10 11 12 13 IEC/IEEE...