SN54/74LS253 DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The LSTTL / MSI SN54 / 74LS253 is a Dual 4-Input Multiplexer with 3-state outputs. It can select two bits of data from four sources using common select inputs. The outputs may be individually switched to a high impedance state with a HIGH on the respective Output Enable (E0) inputs, allowing the outputs to interface directly with bus oriented systems. It is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families.
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DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY
Schottky Process for High Speed Multifunction Capability Non-Inverting 3-State Outputs Input Clamp Diodes Limit High Speed Termination Effects
J SUFFIX CERAMIC CASE 620-09 16
CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16
E0b 15
S0 14
I3b 13
I2b 12
I1b 11
I0b 10
1
Zb 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
1 E0a
2 S1
3 I3a
4 I2a
5 I1a
6 I0a
7 Za
1
1
LOADING (Note a)
Common Select Inputs
D SUFFIX SOIC CASE 751B-03
16
HIGH S0, S1 Multiplexer A E0a I0a – I3a Za Multiplexer B E0b I0b – I3b Zb
16
8 GND
PIN NAMES
N SUFFIX PLASTIC CASE 648-08
ORDERING INFORMATION
LOW
0.5 U.L.
0.25 U.L.
Output Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b)
0.5 U.L. 0.5 U.L. 65 (25) U.L.
0.25 U.L. 0.25 U.L. 15 (7.5) U.L.
Output Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b)
0.5 U.L. 0.5 U.L. 65 (25) U.L.
0.25 U.L. 0.25 U.L. 15 (7.5) U.L.
SN54LSXXXJ SN74LSXXXN SN74LSXXXD
Ceramic Plastic SOIC
LOGIC SYMBOL
NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial (74) Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military (54) and 65 U.L. for Commercial (74) Temperature Ranges.
1
14 2
6 5 4
3
10 11 12 13 15
E I I I I I I I I E S0 0a 0a 1a 2a 3a 0b 1b 2b 3b 0b S1
Za
Zb
7
9
VCC = PIN 16 GND = PIN 8
FAST AND LS TTL DATA 5-1