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HD74HC77
4-bit Bistable Latch
Description
The HD74HC77 is ideally suited for use as temporary storage for binary information between processing units and input/output or indicator units. Information present at a data (D) input is transferred to the Q output when the enable (G) is high and the Q output will follow the data input as long as the enable remains high. When the enable goes low the information (that was present at the data input at the time the transition occurred) is retained at the Q output until the enable is permitted to go high.
Features
• • • • • High Speed Operation: tpd (D to Q) = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 2 µA max (Ta = 25°C)
Function Table
Inputs D L H X G H H L Output Q L H No change
HD74HC77
Pin Arrangement
1D 1 2D 2 Enable3-4 3 VCC 4 3D 5 4D 6 NC 7 D D Q G G Q Q D G D G Q
14 1Q 13 2Q 12 Enable1-2 11 GND 10 NC 9 3Q 8 4Q
(Top view)
Block Diagram (1//4)
Data
Q
Enable
2
HD74HC77
DC Characteristics
Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 20 µA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions
VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 — 3.15 — 4.2 — — — — — — — — — — 0.5 1.5 3.15 4.2 —
VIL
2.0 4.5 6.0
1.35 — 1.8 — 1.9 4.4 5.9 4.13 5.63 — — —
Output voltage
VOH
2.0 4.5 6.0 4.5 6.0
1.9 2.0 — 4.4 4.5 — 5.9 6.0 — 4.18 — 5.68 — — — — — — — — — —
VOL
2.0 4.5 6.0 4.5 6.0
0.0 0.1 0.0 0.1 0.0 0.1 — — — —
0.26 — 0.26 — ±0.1 — 2.0 —
Input current Quiescent supply current
Iin I CC
6.0 6.0
3
HD74HC77
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C Item Symbol Ta = –40 to +85°C Max 130 26 22 125 25 21 — — — 95 19 16 10 pF ns ns G to Q Unit ns Test Conditions D to Q
VCC (V) Min Typ Max Min 2.0 4.5 6.0 2.0 4.5 6.0 — — — — — — 5 5 5 — — — — — 12 — — 13 — — 1 — — 5 — 5 105 — 21 18 — —
Propagation delay t PLH time t PHL
100 — 20 17 — — — 75 15 13 10 — — 5 5 5 — — — —
Hold time
th
2.0 4.5 6.0
Output rise/fall time
t TLH t THL
2.0 4.5 6.0
Input capacitance
Cin
—
4
Unit: mm
19.20 20.32 Max 14 8 6.30 7.40 Max 1
2.39 Max
1.30
7 7.62
0.51 Min
2.54 Min 5.06 Max
2.54 ± 0.25
0.48 ± 0.10
0.25 – 0.05 0° – 15°
+ 0.10
Hitachi Code JEDEC EIAJ Weight (reference value)
DP-14 Conforms Conforms 0.97 g
Unit: mm
10.06 10.5 Max 14 8 5.5 1 7 *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 7.80 – 0.30 1.15 0° – 8°
+ 0.20
1.42 Max
1.27 *0.42 ± 0.08 0.40 ± 0.06
0.10 ± 0.10
0.70 ± 0.20
0.15 0.12 M
Hitachi Code JEDEC EIAJ Weight (reference value) FP-14DA — Conforms 0.23 g
*Dimension including the plating thickness Base material dimension
Unit: mm
8.65 9.05 Max 14 8 3.95 1 1.75 Max 7
*0.20 ± 0.05
6.10 – 0.30 1.08
+ 0.10
0.635 Max
0° – 8°
0.