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ICM7170IBG Datasheet(PDF) 11 Page - Intersil Corporation |
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ICM7170IBG Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 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. 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 11 12 13 14 15 16 17 18 20 19 10 9 8 7 6 5 4 3 2 1 U3 1 2 3 4 5 6 7 8 9 10 11 12 16 17 18 19 20 21 22 23 24 15 14 13 11 12 13 14 15 16 17 18 20 19 10 9 8 7 6 5 4 3 2 1 A11 AEN S1 S2 S3 S4 A26 A5 A25 A6 A24 A7 A23 A8 A22 A9 A31 A0 A30 A1 A29 A2 A28 A3 A27 A4 B4 IRQ2 B23 IRQ5 B24 IRQ4 B25 IRQ3 TP1 POSITIVE INTERRUPT C1 C2 C3 X1 R2 B1 SR2 C4 J1 C7 C5 C6 IOR B14 IOW B13 5V B3.B29 GND B1.B31 D7 A2 D6 A3 D5 A4 D4 A5 D3 A6 D2 A7 D1 A8 D0 A9 D1 OPTIONAL DIODE AND RESISTOR SEE NOTE 8 R1 1K S1 S2 S3 S4 74LS688 U2 ICM7170 U5 74LS245 U1 74LS139 + - DSI INTERRUPT SELECT FIGURE 9. IBM PC INTERFACE FOR ICM7170Y ICM7170 |
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