HD74HC279 Datasheet, PDF (1/6 Pages) Hitachi Semiconductor – Quad. S-R Latches

HD74HC279
Octal D-type Flip-Flops (with Clear)
REJ03D0605–0200
(Previous ADE-205-483)
Rev.2.00
Jan 31, 2006
Description
The latch is ideally suited for use as temporary stage for binary information processing and input/output units. When
either S or R is low, output is dependent on R input. When both inputs are high, Output is stored before the indicated
steady-state input conditions were established. And when both inputs are low, output is high, but this high level are
uncontinuance, if either of input goes high.
Features
• High Speed Operation: t_pd (S to Q) = 10 ns typ (C_L = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: V_CC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I_CC (static) = 2 µA max (Ta = 25°C)
• Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC279FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
HD74HC279RPEL SOP-16 pin (JEDEC)
PRSP0016DG-A
(FP-16DNV)
RP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
Function Table
Inputs
S*²
R
Output
Q
H
H
Q₀
L
H
H
H
L
L
L
L
H*¹
H : High level
L : Low level
Q₀ : The level of Q respectively, before the indicated steady-state input conditions were established.
Notes: 1. It is unpredictable, if S or R goes High.
2. As to latches which has two S inputs.
H: Both of S inputs are high.
L: Either or both of S inputs are low.
Rev.2.00 Jan 31, 2006 page 1 of 5