TMS380C26

NETWORK COMMPROCESSOR

SPWS010A±APRIL 1992±REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

power up, SBCLK, OSCIN, MBCLK1, MBCLK2, SYNCIN, and SRESET timing

NO.

 

 

 

 

PARAMETER

MIN

MAX

UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100²

tr(VDD)

Rise time from 1.2 V to VDD minimum high level

 

1

ms

101²³

td(VDDH-SCKV)

Delay time from minimum VDD high level to first valid SBCLK no longer high

 

1

ms

102²³

td(VDDH-OSCV)

Delay time from minimum VDD high level to first valid OSCIN high

 

1

ms

103

tc(SCK)

Cycle time of SBCLK

 

 

 

 

62.5

 

ns

104

tw(SCKH)

Pulse duration of SBCLK high

 

 

 

 

26

 

ns

105

tw(SCKL)

Pulse duration of SBCLK low

 

 

 

 

26

 

ns

106²

tt(SCK)

Transition time of SBCLK

 

 

 

 

 

5

ns

107

tc(OSC)

Cycle time of OSCIN (see Note 12)

 

 

15.6

500

ns

108

tw(OSCH)

Pulse duration of OSCIN high

 

 

 

 

5.5

 

ns

109

tw(OSCL)

Pulse duration of OSCIN low

 

 

 

 

5.5

 

ns

110²

tt(OSC)

Transition time of OSCIN

 

 

 

 

 

3

ns

111²

td(OSCV-CKV)

Delay time from OSCIN valid to MBCLK1 and MBCLK2 valid

 

1

ms

117²

t

Hold time of

 

 

low after V

 

 

reaches minimum high level

5

 

ms

SRESET

DD

 

 

h(VDDH-RSL)

 

 

 

 

 

 

 

 

 

 

 

 

118²

t

Pulse duration of

 

 

 

high

 

 

 

 

14

 

s

SRESET

 

 

 

 

 

 

 

w(RSH)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

119²

t

Pulse duration of

 

 

 

low

 

 

 

 

14

 

s

SRESET

 

 

 

 

 

 

 

w(RSL)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

288²

tsu(RST)

Setup time of DMA size to

 

 

 

high (Intel mode only)

15

 

ns

SRESET

 

289²

th(RST)

Hold time of DMA size from

 

 

 

 

high (Intel mode only)

15

 

ns

SRESET

 

 

tM

One-eighth of an local memory cycle

 

 

2tc(OSC)

 

 

² This specification is provided as an aid to board design.

³ If parameter 101 or 102 cannot be met, parameter 117 must be extended by the larger difference: real value of parameter 101 or 102 minus the max value listed.

NOTE 12: If OSCIN is used to generate PXTALIN, the specification for the tolerance of OSCIN is equal to ± 0.01%.

34

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Page 34
Image 34
Texas Instruments TMS380C26 Parameter MIN MAX Unit, Reaches minimum high level, HVDDH-RSL 118² Pulse duration High