AK2548 Datasheet, PDF (14/30 Pages) Asahi Kasei Microsystems – 7 channel E1 Transceiver

ASAHI KASEI
[AK2548]
AC CHARACTERISTICS(Parallel Port)
Parameter
Symbol Min
Typ
Max
Read/Write Cycle
tcyc
250
Motorola Mode
Address Setup Time
t1
10
—
—
Address Hold Time
t2
10
—
—
AS to DS Delay Time
t3
20
—
—
DS to AS Delay Time
t4
20
—
—
Read Data Delay Time
t5
—
—
40
Read Data Hold Time
t6
—
—
20
R/W Setup Time
t7
10
—
—
R/W Hold Time
t8
10
—
—
CS Setup Time
t9
10
—
—
CS Hold Time
t10
15
—
—
DS to Write Data Setup Time
t11
40
—
—
DS to Write Data Hold Time
t12
20
—
—
DS Pulse Width
t13
100
—
—
AS Pulse Width
t14
20
—
—
Address Invalid to DS Delay Time t15
0
—
—
Intel Mode
Address Setup Time
t21
10
—
—
Address Hold Time
t22
10
—
—
ALE to WR Delay Time
t23
20
—
—
WR to ALE Delay Time
t24
20
—
—
RD to ALE Delay Time
t25
20
—
—
Read Data Delay Time
t26
—
—
40
Read Data Hold Time
t27
—
—
20
CS Setup Time
t28
10
—
—
CS Hold Time
t29
15
—
—
DS to Write Data Setup Time
t30
40
—
—
DS to Write Data Hold Time
t31
20
—
—
RD Pulse Width
t32
100
—
—
WR Pulse Width
t33
100
—
—
ALE Pulse Width
t34
20
—
—
Address Invalid to RD Delay Time t35
0
—
—
Notes) CL= 50pF on AD0-AD7. All of the timing is specified at 50%VDD.
Units Condition
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
ns
ns
ns
ns
ns
ns
C0028-E-00
14
1999/9