DS89C420 Dallas Semiconducotr, DS89C420 Datasheet - Page 45

• Manufacturer Part Number: DS89C420
• Description: Ultra-High-Speed Microcontroller
• Manufacturer: Dallas Semiconducotr

Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: All voltages are referenced to ground.
Note 3: Active current is measured with a 33MHz clock source driving XTAL1, V
Note 4: Idle mode current measured with a 33MHz clock source driving XTAL1, V
Note 5: Stop mode measured with XTAL and RST grounded, V
Note 6: When addressing external memory.
Note 7: RST = 5.5V. This condition mimics the operation of pins in I/O mode.
Note 8: During a 0-to-1 transition, a one-shot drives the ports hard for two clock cycles. This measurement reflects a port pin in transition mode.
Note 9: Ports 1, 2, and 3 source transition current when being pulled down externally. The current reaches its maximum at approximately 2V.
Note 10: This port is a weak address holding latch in bus mode. Peak current occurs near the input transition point of the holding latch at
Note 11: RST = 5.5V. Port 0 floating during reset and when in the logic-high state during I/O mode.
Note 12: While the specifications for V
Note 13: The user should note that this part is tested and guaranteed to operate down to 4.5V (10%) and that V
Note 14: Guaranteed by design.
approximately 2V.
given, there is a guaranteed separation between these two voltages.
point. This indicates that there is a range of voltages [V
reset trip point has not been reached. This should not be an issue in most applications, but should be considered when proper
operation must be maintained at all times. For these applications, it may be desirable to use a more accurate external reset.
PFW
and V
RST
overlap, the design of the hardware makes it such that this is not possible. Within the ranges
CC
45 of 59
= 5.5V. All other pins disconnected.
MIN
to V
RST
(min)] where the processor’s operation is not guaranteed, but the
CC
CC
= RST = 5.5V. All other pins disconnected.
= 5.5V, RST at ground. All other pins disconnected.
RST
(min) is specified below that