DS87C520MCL Datasheet, PDF (30/44 Pages) Dallas Semiconductor – EPROM/ROM High-Speed Microcontrollers

DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
DC ELECTRICAL CHARACTERISTICS (continued)
(V_CC = 4.5V, T_A = -40°C to +85°C.)
PARAMETER
SYMBOL MIN
TYP MAX UNITS NOTES
Transition Current from 1 to 0 Ports 1, 2, 3
at 2V
I_TL
Input Leakage Port 0, and EA pins, I/O
Mode
I_L
-10
Input Leakage Port 0, Bus Mode
I_L
-300
RST Pulldown Resistance
R_RST
50
-800
µA
9
+10
µA
11
+300
µA
10
200
kW
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
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, VCC = RST = 5.5V, other pins disconnected.
Idle mode current measured with 33MHz clock source on XTAL1, VCC = 5.5V, RST at ground, other pins
disconnected.
Stop mode current measured with XTAL1 and RST grounded, VCC = 5.5V, all other pins disconnected.
When addressing external memory. This specification only applies to the first clock cycle following the transition.
RST = VCC. This condition mimics operation of pins in I/O mode. Port 0 is tri-stated in reset and when at a logic high
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 < VIN < VCC. Not a high-impedance input. This port is a weak address holding latch in Bus Mode. Peak current
occurs near the input transition point of the latch, approximately 2V.
0.45 < VIN < VCC. RST = VCC. This condition mimics operation of pins in I/O mode.
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.
TYPICAL I_CC vs. FREQUENCY
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