DS80C320 datasheet(21/42 Pages) DALLAS

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DS80C320/DS80C323

21 of 42

NOTES FOR DS80C320 DC ELECTRICAL CHARACTERISTICS:

All parameters apply to both commercial and industrial temperature operation unless otherwise noted.

1. All voltages are referenced to ground.

2. Active current is measured with a 25 MHz clock source driving XTAL1, VCC=RST=5.5V, all other

pins disconnected.

3. Idle mode current is measured with a 25 MHz clock source driving XTAL1, VCC=5.5V, RST at

ground, all other pins disconnected.

4. Stop mode current measured with XTAL1 and RST grounded, VCC=5.5V, all other pins disconnected.

when addressing external memory.

5. When addressing external memory.

6. RST=VCC. This condition mimics operation of pins in I/O mode.

7. During a 0 to 1 transition, a one-shot drives the ports hard for two clock cycles. This measurement

reflects port in transition mode.

8. Ports 1, 2, and 3 source transition current when being pulled down externally. It reaches its maximum

at approximately 2V.

9. 0.45<VIN<VCC. Not a high impedance input. This port is a weak address holding latch because Port 0

is dedicated as an address bus on the DS80C320. Peak current occurs near the input transition point of

the latch, approximately 2V.

10. Over the industrial temperature range, this specification has a maximum value of 200 µA.

11. This is the current required from an external circuit to hold a logic low level on an I/O pin while the

corresponding port latch bit is set to 1. This is only the current required to hold the low level;

transitions from 1 to 0 on an I/O pin will also have to overcome the transition current.

12. Device operating range is 4.5V to 5.5V; however, device is tested to 4.0V to ensure proper operation

at minimum VRST .

DS80C320 数据表(PDF) 21 Page - Dallas Semiconductor