XR88C681CP/28 EXAR [Exar Corporation], XR88C681CP/28 Datasheet - Page 9

• Manufacturer Part Number: XR88C681CP/28
• Description: CMOS Dual Channel UART (DUART)
• Manufacturer: EXAR [Exar Corporation]

AC ELECTRICAL CHARACTERISTICS
Test Conditions: T
Reset Timing (See Figure 51)
XR88C681 Read and Write Cycle Timing (Figure 52)
Z-Mode Interrupt Cycle Timing (Figure 53)
Port Timing (Figure 54)
Interrupt Output Timing (Figure 55)
Clock Timing (Figure 56)
Symbol
t
t
t
Rev. 2.11
t
t
RWD
t
t
t
t
t
t
EOD
RES
t
t
t
t
t
t
t
t
DIO
RW
IAS
IAH
EIS
t
CH
DD
DH
AS
AH
CS
DF
DS
PS
PH
PD
IR
RESET Pulse Width
A0-A3 Setup Time to RD, WR
Low
A0-A3 Hold Time from RD, WR
Low
CS Setup Time to RD, WR Low
CS Hold Time from -RD, -WR
High
-RD, -WR Pulse Width
Data Valid from -RD Low
Data Bus Floating from -RD High
Data Setup Time to -WR High
Data Hold Time from -WR High
High Time Between Reads
and/or Writes
IEO Delay Time from IEI
-IACK Setup Time to -RD Low
-IACK Hold Time from -RD High
IEI Setup Time to RD Low
IEO Delay Time from -INTR Low
Port Input Setup Time to
-RD/-CS Low
Port Input Hold Time from
-RD/-CS High
Port Output Valid from -WR/-CS
High
-INTR or OP3 - OP7 when used
as Interrupts High from: Clear of
Interrupts Status Bits in ISR or
IPCR Clear of Interrupt Mask in
IMR
A
= 0 - 70°C, V
4
Parameter
5, 6
CC
= 5V ¦ 5% unless otherwise specified.
1, 2, 3
7
Min.
225
100
1.0
10
10
0
0
0
5
0
0
4
Typ.
100
60
50
9
0
Max.
175
100
100
100
400
300
300
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
A
Conditions
XR88C681