TMS55166 datasheet(38/70 Pages) TI

38 / 70 page

TMS55165, TMS55166, TMS55175, TMS55176

262144 BY 16-BIT MULTIPORT VIDEO RAM

SMVS463 – DECEMBER 1995

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

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

temperature (continued)†

ALT.

’551xx -60

’551xx - 70

UNIT

SYMBOL

MIN

MAX

MIN

MAX

UNIT

td(GHQSF)

Delay time, TRG high to QSF switching, full-register transfer

(see Note 16)

tTQD

td(GLRH)

Delay time, TRG low to RAS high

tROH

td(GLZ)

Delay time, TRG low to DQ in the low-impedance state

tOELZ

td(MSRL)

Delay time, last SC high at boundary (127 or 255) to RAS low,

split-register transfer

td(RHCL)

Delay time, RAS high to CAS low, CBR refresh

tRPC

td(RHMS)

Delay time, RAS high to last SC high at boundary (127 or 255),

split-register-transfer

td(RLCA)

Delay time, RAS low to column address valid

tRAD

’551x5

tCSH

td(RLCH)

Delay time, RAS low to CAS high

’551x6

tCSH

()

CBR

tCHR

td(RLCL)

Delay time, RAS low to CAS low (see Note 17)

tRCD

td(RLQSF)

Delay time, RAS low to QSF switching, full-register transfer

(see Note 16)

tRQD

td(RLSH)

Delay time, RAS low to first SC high after TRG high,

early-load full-register transfer

tRSD

td(RLTH)

Delay time, RAS low to TRG high (see Note 18)

tRTH

td(RLWL)

Delay time, RAS low to first WEx low, read-modify-write

tRWD

td(SCQSF)

Delay time, last SC high at boundary (127 or 255) to QSF switching,

split-register transfer (see Note 16)

tSQD

td(SCTR)

Delay time, SC high to TRG high, full-register transfer

tTSL

td(THRH)

Delay time, TRG high to RAS high (see Note 18)

tTRD

– 10

td(THRL)

Delay time, TRG high to RAS low (see Note 18)

tTRP

td(THSC)

Delay time, TRG high to SC high (see Note 18)

tTSD

trf(MA)

Refresh time interval, memory

tREF

Transition time

† Timing measurements are referenced to VIL max and VIH min.

NOTES: 16. Switching times for QSF output are measured with a load equivalent to 1 TTL load and 30 pF, and output reference level is

VOH / VOL = 2 V/0.8 V.

17. The maximum value is specified only to assure RAS access time.

18. Real-time-load and late-load full-register transfer

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