Specifications

2000 Jun 26 58
Philips Semiconductors Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC for video CD (CD7 II)
SAA7327
Notes
1. The 4-wire bus mode microcontroller interface timing for writing to decoder registers 0 to F, and reading Q-channel
subcode and decoder status, is a function of the overspeed factor ‘n’. In the lock-to-disc mode the maximum data
rate is lower.
2. Negative set-up time means that the data may change after clock transition.
3. If a 16.9344 MHz crystal is used and SELPLL = 0 then the timings are divided-by-2 until the microcontroller has
written X1XX to register B.
WRITE MODE (C
L
= 20 pF)
t
sD
set-up time SDA to SCL 0 − 0 − ns
t
hD
hold time SCL to SDA 950 − 950 − ns
t
sCL
set-up time SCL to
SILD
480 − 480 − ns
t
hCL
hold time SILD to SCL 120 − 120 − ns
t
dPLP
delay between two
SILD pulses
70 − 70 −µs
t
dWZ
delay time SDA
high-impedance to
SILD
0 − 0 − ns
SYMBOL PARAMETER CONDITIONS
NORMAL MODE LOCK-TO-DISC MODE
UNIT
MIN. MAX. MIN. MAX.
SDA (SAA7327)
SCL
RAB
t
r
t
r
0.8 V
t
f
t
f
V
DD
− 0.8 V
V
DD
− 0.8 V
0.8 V
V
DD
− 0.8 V
0.8 V
t
PD
t
CL
t
CH
t
dRD
t
dRZ
high-impedance
MGS244
Fig.34 4-wire bus microcontroller timing; read mode (Q-channel subcode and decoder status information).