TCM29C23, TCM129C23

VARIABLE-FREQUENCY PCM OR DSP INTERFACE

SCTS029A – AUGUST 1989 –REVISED JULY 1996

9

POST OFFICE BOX 655303

receive timing requirements over recommended ranges of supply voltages and operating free-air

temperature, variable-data-rate mode (see Figure 6)

PARAMETER

MIN

MAX

UNIT

td(TSDR)

Time-slot delay time from DCLKR

60

td(DCLKR)–140

ns

td(FSR)

Frame-sync delay time

60

tc(CLK)–60

ns

tsu(PCM IN)

Setup time before bit 7 falling edge

10

ns

th(PCM IN)

Hold time after bit 8 falling edge

60

ns

tc(DCLKR)

Data clock frequency

244

15620

ns

tSER

Time-slot end receive time

0

ns

switching characteristics

propagation delay times over recommended ranges of operating conditions, fixed-data-rate mode (see

Figure 3)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

tpd1

From rising edge of transmit clock to bit 1 data valid at PCM OUT

(data enable time on time-slot entry) (see Note 8)

CL = 0 to 100 pF

0

90

ns

tpd2

From rising edge of transmit clock bit n to bit data valid at PCM OUT

(data valid time)

CL = 0 to 100 pF

0

90

ns

tpd3

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)

CL = 0

60

215

ns

tpd4

From rising edge of transmit clock bit 1 to TSX active (low)

(time slot enable time)

CL = 0 to 100 pF

0

90

ns

tpd5

From falling edge of transmit clock bit 8 to TSX inactive (high)

(time-slot disable time) (see Note 8)

CL = 0

60

190

ns

NOTE 8: Timing parameters tpd1, tpd3, and tpd5 are referenced to the high-impedance state.

propagation delay times over recommended ranges of operating conditions, variable-data-rate

mode (see Note 9 and Figure 5)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

tpd7

Data delay time from DCLKX

0

90

ns

tpd8

Data delay from time-slot enable to PCM OUT

CL = 0 to 100 pF

0

50

ns

tpd9

Data delay from time-slot disable to PCM OUT

0

80

ns

tpd10

Data delay time from FSX

td(TSDX) = 80 ns

0

90

ns

NOTE 9: Timing parameters tpd8 and tpd9 are referenced to the high-impedance state.