TCM29C23_12 Datasheet, PDF (9/20 Pages) Texas Instruments – VARIABLE-FREQUENCY PCM OR DSP INTERFACE

TCM29C23, TCM129C23
VARIABLE-FREQUENCY PCM OR DSP INTERFACE
SCTS029B − AUGUST 1989 − REVISED NOVEMBER 1996
receive timing requirements over recommended ranges of variable-data-rate mode (see Figure 6)
t_d(TSDR)
t_d(FSR)
t_{su(PCM IN)}
t_{h(PCM IN)}
t_c(DCLKR)
t_(SER)
Time-slot delay time from DCLKR
Frame-sync delay time
Setup time before bit 7 falling edge
Hold time after bit 8 falling edge
Data clock frequency
Time-slot end receive time
MIN
MAX
UNIT
60 t_d(DCLKR)−140 ns
60
t_c(CLK)− 60 ns
10
ns
60
ns
244
15620
ns
0
ns
switching characteristics
propagation delay times over recommended ranges of supply voltages and operating free-air temperature,
fixed-data-rate mode (see Figure 3)
PARAMETER
TEST CONDITIONS
t_pd1
Delay time from rising edge of transmit clock to bit 1 data valid at PCM OUT
(data enable time on time-slot entry) (see Note 8)
C_L = 0 to 100 pF
t_pd2
Delay time from rising edge of transmit clock bit n to bit data valid at PCM OUT
(data valid time)
C_L = 0 to 100 pF
t_pd3
Delay time from falling edge of transmit clock bit 8 to bit 8 Hi-Z at PCM OUT
(data float time on time-slot exit) (see Note 8)
C_L = 0
t_pd4
Delay time from rising edge of transmit clock bit 1 to TSX active (low)
(time slot enable time)
C_L = 0 to 100 pF
t_pd5
Delay time from falling edge of transmit clock bit 8 to TSX inactive (high)
(time-slot disable time) (see Note 8)
C_L = 0
NOTE 8: Timing parameters t_pd1, t_pd3, and t_pd5 are referenced to the high-impedance state.
MIN MAX UNIT
0
90 ns
0
90 ns
60 215 ns
0
90 ns
60 190 ns
propagation delay times over recommended ranges of supply voltages and operating free-air
temperature, variable-data-rate mode (see Note 9 and Figure 5)
PARAMETER
t_pd7
t_pd8
t_pd9
t_pd10
Delay time from DCLKX
Delay from time-slot enable to PCM OUT
Delay from time-slot disable to PCM OUT
Delay time from FSX
NOTE 9: Timing parameters t_pd8 and t_pd9 are referenced to the high-impedance state.
TEST CONDITIONS
C_L = 0 to 100 pF
t_d(TSDX) = 80 ns
MIN MAX UNIT
0
90 ns
0
50 ns
0
80 ns
0
90 ns
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