xr16m2551im48 Exar Corporation, xr16m2551im48 Datasheet - Page 39

• Manufacturer Part Number: xr16m2551im48
• Description: High Performance Low Voltage Duart With 16-byte Fifo And Powersave Feature
• Manufacturer: Exar Corporation

REV. 1.0.2
For PowerSave, the UART internally isolates all of these inputs (except the modem inputs) therefore
eliminating any unnecessary external buffers to keep the inputs steady.
PAGE 21.
AC ELECTRICAL CHARACTERISTICS
Unless otherwise noted: TA = -40
S
XTAL1
T
ECLK
T
T
T
T
T
T
T
T
T
T
YMBOL
T
T
T
T
T
T
T
T
T
T
T
T
T
T
ECLK
WDO
RWS
WDS
WDH
RWH
MOD
RDV
ADS
ADH
RDA
RDH
CSD
CSL
WR
RSI
AS
AH
CS
RD
DY
DD
DY
DS
DH
UART Crystal Oscillator
External Clock
External Clock Time Period
Address Setup Time (16 mode)
Address Hold Time (16 mode)
Chip Select Width (16 mode)
IOR# Strobe Width (16 mode)
Read Cycle Delay (16 mode)
Data Access Time (16 mode)
Data Disable Time (16 mode)
IOW# Strobe Width (16 mode)
Write Cycle Delay (16 mode)
Data Setup Time (16 mode)
Data Hold Time (16 mode)
Address Setup (68 Mode)
Address Hold (68 Mode)
R/W# Setup to CS# (68 Mode)
Read Data Access (68 mode)
Read Data Disable (68 mode)
Write Data Setup (68 mode)
Write Data Hold (68 Mode)
CS# De-asserted to R/W# De-asserted (68 Mode)
CS# Width (68 Mode)
CS# Cycle Delay (68 Mode)
Delay From IOW# To Output
Delay To Set Interrupt From MODEM Input
Delay To Reset Interrupt From IOR#
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
P
ARAMETER
o
to +85
o
C, Vcc=1.62 - 3.63V, 70 pF load where applicable
39
M
1.8V ± 10%
IN
15
65
65
65
65
65
20
20
65
65
0
0
3
0
0
0
3
5
L
IMITS
M
24
32
60
25
60
25
50
50
50
AX
SEE”POWERSAVE FEATURE” ON
M
2.5V ± 10%
IN
10
40
40
40
40
40
10
10
40
40
0
0
3
0
0
0
3
5
L
IMITS
24
50
35
25
35
25
50
50
50
M
AX
M
3.3V ± 10%
IN
35
35
35
35
35
10
10
35
35
7
0
0
3
0
0
0
3
5
XR16M2551
L
IMITS
24
64
30
25
30
25
50
50
50
M
AX
U
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NIT