Application Information
Decoder Timing
V
DD
t
PURS
PURS
SIGNAL IN
NOTONE
Tone 1
Tone 2
Tone 3
Tone ’N’
NOTONE
t
DE
OUTPUTS
Q0 to Q3
t
RESP
’N’
t
NT
t
DC
DATA CHANGE
HOLD
t
HOLD
t
NORM
t
PUL
Fig.3 Timing with the Chip Select Input Held “Low”;
CS and IRQ are not used
V
DD
t
PURS
PURS
SIGNAL IN
NOTONE
Tone 1
OUTPUTS
Q0 - Q3
(INTERNAL)
DATA CHANGE
E
F
1
t
RIRQ
IRQ
t
IR
CS
t
ACS
DATA OUT Q0 - Q3
TRI-STATE
VALID DATA
(READ DATA)
t
HIZ
TRI-STATE
VALID DATA
(READ DATA)
Fig.4 Timing with the HOLD Input Held “High”;
CS and IRQ are used
4