Intel 8253 - Revision Summary

82C54
CLOCK AND GATE
231244–17
* Last byte of count being written
A.C. TESTING INPUT, OUTPUT WAVEFORM
INPUT/OUTPUT
231244–18
A.C. Testing: Inputs are driven at 2.4V for a logic ‘‘1’’ and 0.45V
for a logic ‘‘0.’’ Timing measurements are made at 2.0V for a logic
‘‘1’’ and 0.8V for a logic ‘‘0.’’
A.C. TESTING LOAD CIRCUIT
231244–19
C
L
e
150 pF
C
L
includes jig capacitance
REVISION SUMMARY
The following list represents the key differences be-
tween Rev. 005 and 006 of the 82C54 Data Sheet.
1. References to and specifications for the 8 MHz
82C54 are removed. Only the 10 MHz 82C52-2
remains in production.
18