TC74HC257AP/AF
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74HC257AP, TC74HC257AF
Quad 2-Channel Multiplexer (3-state)
The TC74HC257A is high speed CMOS MULTIPLEXER
fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
LSTTL while maintaining the CMOS low power dissipation.
It is composed of four independent 2-channel multiplexers with
common SELECT and OUTPUT ENABLE ( OE ).
If OE is set low, the outputs are held in a high-impedance
state. When SELECT is set low, “A” data inputs are enabled.
Conversely, when SELECT is high, “B” data inputs are
enabled.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
TC74HC257AP
TC74HC257AF
Features
•
High speed: tpd = 10 ns (typ.) at VCC = 5 V
•
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
•
High noise immunity: VNIH = VNIL = 28% VCC (min)
•
Output drive capability: 15 LSTTL loads
•
•
Symmetrical output impedance: |IOH| = IOL = 6 mA (min)
∼
Balanced propagation delays: tpLH − tpHL
•
Wide operating voltage range: VCC (opr) = 2 to 6 V
•
Pin and function compatible with 74LS257
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
: 1.00 g (typ.)
: 0.18 g (typ.)
Pin Assignment
Start of commercial production
1986-11
1
2014-03-01
