ICM7170IBG Intersil, ICM7170IBG Datasheet - Page 11

• Manufacturer Part Number: ICM7170IBG
• Manufacturer: Intersil

Specifications of ICM7170IBG

• Bus Type: Multiplexed
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Package Type: SOIC W
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 24
• Mounting: Surface Mount
• Date Format: Binary
• Time Format: Binary
• Lead Free Status / RoHS Status: Not Compliant

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.
B23 IRQ5
B24 IRQ4
B25 IRQ3
B4 IRQ2
A11 AEN
A26 A5
A25 A6
A24 A7
A23 A8
A22 A9
A31 A0
A30 A1
A29 A2
A28 A3
A27 A4
INTERRUPT
S1
S2
S3
S4
S1
S2
S3
S4
SELECT
DSI
POSITIVE INTERRUPT
TP1
C2
11
C3
R1
X1
C1
1K
FIGURE 9. IBM PC INTERFACE FOR ICM7170Y
10
11
12
1
2
3
4
5
6
7
8
9
10
ICM7170
1
2
3
4
5
6
7
8
9
U2
74LS688
ICM7170
U3
24
23
22
21
20
19
18
17
16
15
14
13
20
19
18
17
16
15
14
13
12
11
When trimming the oscillator, the frequency counter must be
triggered on the rising edge of the interrupt signal.
NOTE:
Panasonic
Rayovac
1.IBM, IBM PC, and IBM XT are trademarks of IBM Corp.
R2
BATTERIES
+
-
D1 OPTIONAL DIODE AND
RESISTOR SEE NOTE 8
B1
C5
SR2
C4
J1
Saronix
Statek
Seiko
10
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
74LS245
74LS139
TABLE 6.
U5
U1
32kHz
32kHz
2MHz
CRYSTALS
20
19
18
17
16
15
14
13
12
11
16
15
14
13
12
11
10
9
5V B3.B29
GND B1.B31
D7 A2
D6 A3
D5 A4
D4 A5
D3 A6
D2 A7
D1 A8
D0 A9
C7
NTF3238
CX - 1V
GT - 38
C6
IOR B14
IOW B13