ls7210 LSI Computer Systems, Inc., ls7210 Datasheet - Page 4

• Manufacturer Part Number: ls7210
• Description: Programmable Digital Delay Timer
• Manufacturer: LSI Computer Systems, Inc.

7210-061606-4
TRIGGER
EXT
CLOCK
CLOCK
SELECT
.005µF
OSC
NOTE:
68k
V
V
f = 3.17kHz
DD
SS
A
B
14
5
7
3
4
6
2
1
Inputs A, B in Dual-Delay mode. For symmetical flasher tie Pins 8, 9, 10, 11 and 12 to fixed logic level.
+V
+V
+V
+V
+V
+V
f
+V
-V
LATCH
LATCH
LATCH
2
1
3
4
5
6
7
EXT
CLK
B
A
TRIG
CS
OSC
V
DD
NOTE:
FIGURE 6. ASYMMETRICAL FLASHER
÷ 1023 is standard. Any number from 1 to 1022 can be mask programmed.
WB3
WB4
WB0
WB1
WB2
OUT
V
CLOCK
SELECT
LOGIC
SS
FIGURE 5. LS7210 BLOCK DIAGRAM
14
13
12
11
10
9
8
PRESCALER
÷ 1023
(SEE NOTE)
47k
POR
GENERATOR
OUT
+V
OUT
323ms
CONTROL LOGIC
TIMER
+V
8.068 s
10
11
12
OUTPUT
LATCH
8
9
WB3
WB1
WB4
WB2
WB0
+V
13
OUT