Datasheet

DS1677
14 of 18
CAPACITANCE (T
A
= +25C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Input Capacitance C
I
10 pF
I/O Capacitance C
I/O
15 pF
Crystal Capacitance C
X
6 pF
AC ELECTRICAL CHARACTERISTICS (0C to 70C; V
CC
=5.0V10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Data to Clock Setup t
DC
50 ns 6
CLK to Data Hold t
CDH
70 ns 6
CLK to Data Delay t
CDD
200 ns 6,7,8
CLK to Low Time t
CL
250 ns 6
CLK to High Time t
CH
250 ns 6
CLK Frequency t
CLK
2.0 MHz 6
CLK Rise and Fall t
R
, t
F
500 ns
CS to CLK Setup t
CC
1
s
6
CLK to CS Hold t
CCH
60 ns 6
CS Inactive Time t
CWH
1
s
6
CS to I/O High-Z t
CDZ
70 ns 6
V
CC
Slew Rate (4.5V to 2.3V) t
F
1 ms
V
CC
Slew Rate (2.3V to 4.5V) t
R
0 ns
V
CC
Detect to RST (V
CC
Falling)
t
RPD
100 ns
Reset Active Time t
RST
250 ms 13
Pushbutton Debounce PB
DB
250 ms 13
V
CC
Detect to RST (V
CC
Rising)
t
RPU
250 ms 13, 14
ST Pulse Width
t
ST
20 ns
Chip Enable Propagation Delay to
External SRAM
t
CED
8 15 ns
Nominal Voltage to V
CC
Switchover
Fall Time
t
FB
200
s
PFI Low to PFO Low
t
PFD
2
s
PFI High to PFO High
t
PFU
2
s