HIT HD74BC563A Datasheet
HD74BC563A
Octal D Type Transparent Latches With 3 State Outputs
ADE-205-040 (Z)
Rev. 0
June 1993
Description
HD74BC563A provides high drivability and operation equal to or better than high speed bipolar standard
logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high
speed bipolar logic IC, when the frequency is 10 MHz. The device has eight D type latches with three state
outputs in a 20 pin package. When the latch enable input is high, the Q outputs will follow the D inputs.
When the latch enable goes low, data at the D inputs will be retained at the outputs until latch enable
returns high again. When a high logic level is applied to the output control input, all outputs go to a high
impedance state, regardless of what signals are present at the other inputs and the state of the storage
elements.
Features
• Input/Output are at high impedance state when power supply is off.
• Built in input pull up circuit can make input pins be open, when not used.
• TTL level input
• Wide operating temperature range
Ta = –40 to +85°C.
Function Table
Output Control Latch Enable Data Output Q
LH H L
LH L H
LLXQ
HX X Z
H : High level
L : Low level
X : Immaterial
Z : High impedance
Q
: Level of Q before the indicated steady state input conditions were established.
0
0
HD74BC563A
Pin Arrangement
Output
Control
1D
2D
3D
4D
5D
6D
7D
8D
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
Latch
Enable
(Top view)
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage V
Input diode current I
Input voltage V
Output voltage V
Off state output voltage V
CC
IK
IN
OUT
OUT(off)
Storage temperature Tstg –65 to +150 °C
Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
–0.5 to +7.0 V
±30 mA
–0.5 to +7.5 V
–0.5 to +7.5 V
–0.5 to +5.5 V
2
HD74BC563A
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage V
Input voltage V
Output voltage V
CC
IN
OUT
Operating temperature Topr –40 — 85 °C
Input rise/fall time*
1
tr, t
f
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
Output
Control
4.5 5.0 5.5 V
0—VCCV
0—VCCV
0 — 8 ns/V
1D
2D
7D
8D
Latch
Enable
D Q
CK
D Q
CK
D Q
CK
D Q
CK
1Q
2Q
7Q
8Q
3
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