AK7712A-VT Datasheet, PDF (19/87 Pages) Asahi Kasei Microsystems – Built-in 20-bit ADC/DAC Sophisticated Audio DSP

ASAHI KASEI
[AK7712A-VT]
6) Read/write Interface Timing of Pseudo SRAM(External RAM) (normal mode)
(AVDD,DVDD,AVB,DVB=5.0V±5%, Ta=25°C, CL=20pF)
Parameter
Address delay time from OE "↑" (writing)
Address delay time from OE "↑" (reading)
Hold time of column address
Address setup time
Pulse width of chip enable
Pre-charge time of chip enable
Chip enable time
Pulse width of write command
Data set time
Data hold time
Symbol
tAOEW
tAOER
tCAH
tAS
tCE
tP
tCW
tWP
tDW
tDH
XTI(MHz)
18.432
16.934
min max min max
-15
15 -18
18
70
80
110
120
10
12
90
100
40
50
90
100
35
40
100
110
10
12
12.288
min max
-20
20
110
170
15
135
60
135
60
160
15
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
7) Refresh Interface Timing of DRAM(External RAM) (CAS before RAS Refresh)
(AVDD,DVDD,AVB,DVB=5.0V±5%, Ta=25°C, CL=20pF)
Parameter
Read cycle
Pulse width of RASCE"H"
Pulse width of RASCE"L"
RASCE Pre-charge ^• CASRF hold time
CASRF setup time at auto refresh
CASRF hold time at auto refresh
Symbol
tCRD
tWRH
tWRL
tRPC
tSUR
tHRRC
18.432
min max
240
105
105
80
10
200
XTI(MHz)
16.934
min max
260
120
120
90
12
220
12.288
min max
360
170
170
130
15
320
Units
ns
ns
ns
ns
ns
ns
8) Read/Write Interface Timing of DRAM(External RAM) (Page Mode)
(AVDD,DVDD,AVB,DVB=5.0V±5%, Ta=25°C, CL=20pF)
Parameter
Address delay time fromOE "↑" (write)
Address delay time fromOE "↓" (read)
RASCE preceded address setup time
RASCE followed address hold time
CASRF preceded address setup time
CASRF followed address hold time
CASRF hold time after write
Write hold time after CASRF
Write pulse width
Data setup time
Data hold time after write
Pulse width of CASRF"H"
Pulse width of CASRF"L"
Symbol
tAOEW
tAOER
tSURA
tHRA
tSUCA
tHCLCA
tHWCH
tHCLW
tW
tSUD
tHWLD
tWCH
tWCL
18.432
min max
-15
15
70
10
12
10
45
40
55
40
0
60
22
54
XTI(MHz)
16.934
min max
-18
18
80
12
14
12
45
43
65
43
0
70
24
62
12.288
min max
-20
20
110
15
18
15
60
60
90
60
0
100
32
90
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
0180-E-02
- 19 -
1997/12