Philips Semiconductors Product specification
74F821/822/823/824/825/826Bus interface registers
1996 Jan 05
9
LOGIC DIAGRAM FOR 74F826
V
CC
= Pin 24
GND = Pin 12
D0
D
R
Q
Q0
D1
Q
1
3
22
D2
Q
2
4
21
D3
Q
3
5
20
D4
Q
4
6
19
D5
Q
5
7
18
D6
Q
6
8
17
D7
Q
7
9
16
10
15
CP
CE
14
11
MR
1
OE
0
SF00505A
13
CP
2
23
OE
1
OE
2
D
R
Q
CP
D
R
Q
CP
D
R
Q
CP
D
R
Q
CP
D
R
Q
CP
D
R
Q
CP
D
R
Q
CP
FUNCTION TABLE FOR 74F825 AND 74F826
OUTPUTS
74F825 74F826
OPERATING MODE
OEn MR CE* CP Dn Q Q
L L X X X L L Clear
L H L ↑ h H L
L H L ↑ l L H
L H H X X NC NC Hold
H X X X X Z Z High impedance
H = High-voltage level
h = High state must be present one setup time before the low-to-high clock transition
L = Low-voltage level
l = Low state must be present one setup time before the low-to-high clock transition
NC= No change
X = Don’t care
Z = High impedance “off” state
* = Since CE
input is sensitive to very short (<3ns) high-to-low-to-high going spikes while CP is high, users should avoid the use of decoders
or other potentially glitch prone device on the CE
input.
↑ = Low-to-high clock transition
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
PARAMETER RATING UNIT
V
CC
Supply voltage –0.5 to +7.0 V
V
IN
Input voltage –0.5 to +7.0 V
I
IN
Input current –30 to +5 mA
V
OUT
Voltage applied to output in high output state –0.5 to V
CC
V
I
OUT
Current applied to output in low output state 128 mA
p
p
Commercial range 0 to +70 °C
amb
-
u
Industrial range –40 to +85 °C
T
stg
Storage temperature range –65 to +150 °C
