HD74LS279 Datasheet, PDF (3/5 Pages) Hitachi Semiconductor – Quadruple S-R Latches

HD74LS279
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Symbol min. typ.* max. Unit
Condition
Input voltage
V_IH
2.0
—
—
V
V_IL
—
—
0.8
V
Output voltage
V_OH
2.7
—
—
V
V_CC = 4.75 V, V_IH = 2 V, V_IL = 0.8 V,
I_OH = –400 µA
V_OL
—
—
0.4
V
I_OL = 4 mA V_CC = 4.75 V, V_IH = 2 V,
—
—
0.5
I_OL = 8 mA ^VIL ^{= 0.8 V}
I_IH
—
20
µA V_CC = 5.25 V, V_I = 2.7 V
Input current
I_IL
—
–0.4
mA V_CC = 5.25 V, V_I = 0.4 V
I_I
—
0.1
mA V_CC = 5.25 V, V_I = 7 V
Short-circuit output current
I_OS
–20
—
–100
mA V_CC = 5.25 V
Supply current**
I_CC
—
3.8
7
mA V_CC = 5.25 V
Input clamp voltage
V_IK
—
—
–1.5
V
V_CC = 4.75 V, I_IN = –18 mA
Notes: * V_CC = 5 V, Ta = 25°C
** I_CC is measured with all R inputs grounded, all S inputs at 4.5 V, and all outputs open.
Switching Characteristics
(V_CC = 5 V, Ta = 25°C)
Item
Symbol Inputs Output min. typ. max. Unit
Condition
t_PLH
S
Propagation delay time
t_PHL
t_PHL
R
—
12
22
Q
—
13
21
ns C_L = 15 pF, R_L = 2 kΩ
—
15
27
Note: Refer to Test Circuit and Waveform of the Common Item "TTL Common Matter (Document No.: REJ27D0005-
0100)".
Rev.4.00, May 10, 2006, page 3 of 4