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Details, datasheet, quote on part number:N74F253N
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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)
74F253
FEATURES
· 3-State outputs for bus interface and multiplex expansion · Common 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 common 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 common 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) 12mA
ORDERING INFORMATION
COMMERCIAL 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 I0aI3a I0bI3b S0, S1 OEa OEb Ya, Yb DESCRIPTION Port A data inputs Port B data inputs Common 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/0.6mA 20µA/0.6mA 20µA/0.6mA 20µA/0.6mA 20µA/0.6mA 3mA/24mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
6 5 4 3 10 11 12 13
IEC/IEEE SYMBOL
14 2 0 1 G 0 3
I0a 14 2 1 15 S0 S1 OEa OEb
I1a
I2a
I3a
I0b
I1b
I2b
I3b
1 6 5 4 3
EN 0 1 2 3
MUX 7
Ya
Yb
15 10 11 12 9
VCC = Pin 16 GND = Pin 8
7
9
13
SF00799
SF00800
1988 Nov 29
2
8530101 95206
Philips Semiconductors
Product specification
Dual 4-input multiplexer (3-State)
74F253
LOGIC DIAGRAM
OEa 1 I0a 6 I1a 5 I2a 4 I3a 3 S1 2 S0 14 I0b 10 I1b 11 I2b 12 I3b 13 OEb 15
7 VCC = Pin 16 GND = Pin 8 Ya
9 Yb
SF00801
FUNCTION TABLE
INPUTS S0 X L L H H L L H H S1 X L L L L H H H H I0 X L H X X X X X X I1 X X X L H X X X X I2 X X X X X L H X X I3 X X X X X X X L H OE H L L L L L L L L OUTPUT Y Z L H L H L H L H
NOTES: H = High voltage level L = Low voltage level X = Don't care Z = High impedance "off" state
1988 Nov 29
3
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