Universal Peripheral Interface User's Manual

UPI-C42/UPI-L42
AC CHARACTERISTICSÐPROGRAMMING (UPI-C42 AND UPI-L42)
T
A
e
25
§
C
g
5
§
C, V
CC
e
6.25V
g
0.25V, V
DDL
ea
5V
g
0.25V, V
DDH
e
12.75V
g
0.25V
(87C42/87L42 ONLY)
Symbol Parameter Min Max Units
t
AW
Address Setup Time to RESET
u
4t
CY
t
WA
Address Hold Time after RESET
u
4t
CY
t
DW
Data in Setup Time to PROG
v
4t
CY
t
WD
Data in Hold Time after PROG
u
4t
CY
t
PW
Initial Program Pulse Width 95 105 ms
t
TW
Test 0 Setup Time for Program Mode 4t
CY
t
WT
Test 0 Hold Time after Program Mode 4t
CY
t
DO
Test 0 to Data Out Delay 4t
CY
t
WW
RESET Pulse Width to Latch Address 4t
CY
t
r
,t
f
PROG Rise and Fall Times 0.5 100 ms
t
CY
CPU Operation Cycle Time 2.5 3.75 ms
t
RE
RESET Setup Time before EA
u
4t
CY
t
OPW
Overprogram Pulse Width 2.85 78.75 ms
(1)
t
DE
EA High to V
DD
High 1t
CY
NOTES:
1. This variation is a function of the iteration counter value, X.
2. If TEST 0 is high, t
DO
can be triggered by RESET
u
.
AC TESTING INPUT/OUTPUT WAVEFORM
INPUT/OUTPUT
290414–16
AC TESTING LOAD CIRCUIT
290414–17
19