ICM7170 View Datasheet(PDF) - Rochester Electronics
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Description
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ICM7170 Datasheet PDF : 14 Pages
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ICM7170
ICM7170
functioning as an I/O block address decoder. DS1 selects
the interrupt priority.
U5 is used to isolate the ICM7170 from the PC databus for
test purposes. It is only required on heavily-loaded TTL
databuses - the ICM7170 can drive most TTL and CMOS
databuses directly.
Since the IBM PC/XT (Note 1) requires a positive interrupt
transition, the ICM7170s interrupt output transistor has been
configured as a source follower. As a source follower, the
interrupt output signal will swing between 0V and 2.5V.
When trimming the oscillator, the frequency counter must be
triggered on the rising edge of the interrupt signal.
TABLE 6.
BATTERIES
CRYSTALS
Panasonic
Saronix
32kHz
NTF3238
Rayovac
Statek
32kHz
CX - 1V
Seiko
2MHz
GT - 38
NOTE:
1.IBM, IBM PC, and IBM XT are trademarks of IBM Corp.
A11 AEN
S1
S2
S3
S4
A26 A5
A25 A6
A24 A7
A23 A8
A22 A9
C5
1
20
1
16
2
19
2
15
3
18
4
17
5
U3
16
6 74LS688 15
7
14
8
13
9
12
3
14
4
U1
13
5 74LS139 12
6
11
7
10
8
9
10
11
C6
IOR B14
IOW B13
J1
A31 A0
A30 A1
C4
1
24
C7
2
23
1
20
3
22
2
19
4
21
3
18
D7 A2
5
20
4
17
D6 A3
A29 A2
A28 A3
6
U2
19
7
ICM7170 18
5
U5
16
6 74LS245 15
D5 A4
D4 A5
A27 A4
8
17
7
14
D3 A6
9
16
8
13
D2 A7
S1
B4 IRQ2
S2
B23 IRQ5
10
C3 X1
11
C2
C1
12
POSITIVE INTERRUPT
15
9
14
+
SR2
B1
10
13
-
R2
D1 OPTIONAL DIODE AND
RESISTOR SEE NOTE 8
S3
B24 IRQ4
S4
B25 IRQ3
TP1
R1 1K
DSI
INTERRUPT
SELECT
FIGURE 9. IBM PC INTERFACE FOR ICM7170Y
12
D1 A8
11
D0 A9
5V B3.B29
GND B1.B31
Specification Numbe11r ICM7170_IM (IL) REV -
Page 12 of 14
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