SyncMOS Technologies International. Inc.
SM79108
AC Characteristics
(16/25/40MHz, operating conditions; CL for Port 0, ALE and PSEN Outputs=150pF; CL for all Other Output=80pF)
Valid
Cycle
fosc=16MHz
Min. Typ. Max
Variable fosc
Typ. Max
Unit Remarks
Symbol
T LHLL
T AVLL
T LLAX
T LLIV
Parameter
Min.
ALE pulse width
RD/WRT 115
2xT - 10
T - 20
nS
nS
nS
Address Valid to ALE low
Address Hold after ALE low
ALE low to Valid Instruction In
ALE low to #PSEN low
#PSEN pulse width
RD/WRT
RD/WRT
RD
43
53
T - 10
240
177
4xT - 10 nS
T LLPL
T PLPH
T PLIV
RD
53
T - 10
nS
nS
RD
173
3xT - 15
#PSEN low to Valid Instruction In
Instruction Hold after #PSEN
Instruction Float after #PSEN
Address to Valid Instruction In
#PSEN low to Address Float
#RD pulse width
RD
3xT - 10 nS
nS
T PXIX
RD
0
0
T PXIZ
RD
87
292
10
T + 25 nS
5xT - 20 nS
10 nS
nS
T AVIV
RD
T PLAZ
T RLRH
T WLWH
T RLDV
T RHDX
T RHDZ
T LLDV
T AVDV
T LLYL
RD
RD
365
365
6xT - 10
6xT - 10
#WR pulse width
WRT
RD
nS
#RD low to Valid Data In
Data Hold after #RD
302
5xT - 10 nS
nS
RD
0
0
Data Float after #RD
RD
145
590
542
2xT + 20 nS
8xT - 10 nS
9xT - 20 nS
3xT + 10 nS
nS
ALE low to Valid Data In
Address to Valid Data In
ALE low to #WR High or #RD low
Address Valid to #WR or #RD low
Data Valid to #WR High
Data Valid to #WR transition
Data hold after #WR
RD
RD
RD/WRT
RD/WRT
WRT
WRT
WRT
RD
178
230
403
38
197 3xT - 10
4xT - 20
7xT - 35
T - 25
T AVYL
T QVWH
T QVWX
T WHQX
T RLAZ
T YALH
T CHCL
T CLCX
T CLCH
T CHCX
T, TCLCL
nS
nS
73
T + 10
nS
#RD low to Address Float
#WR or #RD high to ALE high
clock fall time
5
nS
RD/WRT
53
72
T -10
T + 10 nS
nS
nS
nS
nS
nS
clock low time
clock rise time
clock high time
clock period
63
1/fosc
Vcc
ICC Active mode test circuit
ICC
Vcc
VCC
8
RST
PO
EA
SM79108
XTAL2
XTAL1
VSS
(NC)
Clock Signal
Specifications subject to change without notice,contact your sales representatives for the most recent information.
19/26
Ver 2.1 SM79108 08/2006
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
