Tandy 1000 HX Technical Reference Manual page 121

8253/8253-5
A.C. CHARACTERISTICS (Continued)
WRITE CYCLE
Symbol
*AW
*WA
tyvw
tow
*RV
Parameter
Address Stable before WRTTE
Address Hold Time for WRITE
WRITE Pulse Width
Data Set Up Time for WRITE
Data Hold Time for WRITE
Recovery Time between WRITE
and Any Other Control Signal
8253
Mln
50
30
400
300
40
1
Max
8253-5
Min
30
30
300
250
30
1
Max
Unit
ns
ns
ns
ns
ns
JlS
CLOCK AND GATE TIMING
Symbol
*CLK
tpWH
tpWL
*GW
tGL
tGS
tGH
tOD
tODG
Parameter
Clock Period
High Pulse Width
Low Pulse Width
Gate Width High
Gate Width Low
Gate Set Up Time to C L K f
Gate Hold Time after CLK T
Output Delay from CLK I (4)
Output Delay from Gate I (4)
8253
Mln
380
230
150
150
100
100
50
Max
dc
400
300
8253-5
Min
380
230
150
150
100
100
50
Max
dc
400
300
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES:
1-IOL
= 2.2 mA.
2.
IOH
- " 4 0 0 ^A.
3. AC timings measured at V
O
H 2.2, VQL ~ 0.8.
4. C
L
= 150 pF.
•For Extended Temperature EXPRESS, use M8253 electrical parameters.
A.C. TESTING INPUT, OUTPUT WAVEFORM
A.C. TESTING LOAD CIRCUIT
2-23