DS87C520 Maxim, DS87C520 Datasheet - Page 31

• Manufacturer Part Number: DS87C520
• Description: The DS87C520/DS83C520 EPROM/ROM high-speed microcontrollers are fast 8051-compatible microcontrollers
• Manufacturer: Maxim

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DC ELECTRICAL CHARACTERISTICS (continued)
(V
TYPICAL I
Transition Current from 1 to 0 Ports 1, 2, 3
at 2V
Input Leakage Port 0, and EA pins, I/O
Mode
Input Leakage Port 0, Bus Mode
RST Pulldown Resistance
CC
= 4.5V, T
Stop mode current measured with XTAL1 and RST grounded, V
When addressing external memory. This specification only applies to the first clock cycle following the transition.
RST = V
state during I/O mode.
During a 0-to-1 transition, a one-shot drives the ports hard for two clock cycles. This measurement reflects port in
transition mode.
Ports 1, 2, and 3 source transition current when being pulled down externally. It reaches its maximum at approximately
2V.
0.45 < V
occurs near the input transition point of the latch, approximately 2V.
0.45 < V
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.
All parameters apply to both commercial and industrial temperature operation, unless otherwise noted.
All voltages are referenced to ground.
Active current measured with 33MHz clock source on XTAL1, V
Idle mode current measured with 33MHz clock source on XTAL1, V
disconnected.
CC
PARAMETER
A
vs. FREQUENCY
= -40°C to +85°C.)
IN
IN
CC
< V
< V
. This condition mimics operation of pins in I/O mode. Port 0 is tri-stated in reset and when at a logic high
CC
CC
. Not a high-impedance input. This port is a weak address holding latch in Bus Mode. Peak current
. RST = V
CC
. This condition mimics operation of pins in I/O mode.
SYMBOL
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
R
I
I
I
TL
RST
L
L
31 of 43
MIN
-300
-10
50
CC
CC
= RST = 5.5V, other pins disconnected.
= 5.5V, all other pins disconnected.
CC
= 5.5V, RST at ground, other pins
TYP
MAX
+300
-800
+10
200
UNITS
μA
μA
μA
k
NOTES
11
10
9