AK7712A-VT Datasheet, PDF (18/87 Pages) Asahi Kasei Microsystems – Built-in 20-bit ADC/DAC Sophisticated Audio DSP

ASAHI KASEI
[AK7712A-VT]
3)Read/Write Interface Timing of External RAM
(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)
Access time
Address set-up time
Data set time
Data hold time
Pulse width to write
Symbol
tAOEW
tAOER
tWCY
tWD
tDS
tDH
tWP
18.432
min max
-15
15
70
105
10
80
10
60
XTI(MHz)
16.934
min max
-18
18
80
115
12
90
12
70
12.288
min max
-20
20
110
170
15
135
15
90
Units
ns
ns
ns
ns
ns
ns
ns
4) Refresh Interface Timing of Pseudo SRAM(External RAM)
(AVDD,DVDD,AVB,DVB=5.0V±5%, Ta=25°C, CL=20pF)
Parameter
Auto refresh cycle
Pulse width of refresh command
Delay time of refresh command
Pre-charge time of refresh
Symbol
tFC
tFAP
tRFD
tFP
18.432
min max
145
80
100
35
XTI(MHz)
16.934
min max
162
90
110
40
12.288
min max
210
135
160
60
Units
ns
ns
ns
ns
5) Read/Write Interface Timing of Pseudo SRAM(External RAM) (Static Column 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)
Column address hold time
SC mode read/write cycle
Address setup time
Pulse width of chip enable
Column address hold time (after write)
Chip enable time
Column address setup time
Pulse width of write command
Data set time
Data hold time
Symbol
tAOEW
tAOER
tCAH
tRSC
tAS
tCE
tAHW
tCW
tASW
tWP
tDW
tDH
18 .432
min max
-15
15
70
110
80
10
180
10
95
10
35
50
10
XTI(MHz)
16.934
min max
-18
18
80
120
90
12
200
12
105
12
40
60
12
12.288
min max
-20
20
110
170
135
15
280
15
140
15
60
90
15
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
0180-E-02
- 18 -
1997/12