ST10F276E datasheet(208/235 Pages) STMICROELECTRONICS

208 / 235 page

Electrical characteristics

ST10F276E

208/235

Doc ID 12303 Rev 3

23.8.17

External memory bus timing

In the next sections the external memory bus timings are described. The given values are

computed for a maximum CPU clock of 40 MHz.

It is evident that when higher CPU clock frequency is used (up to 64 MHz), some numbers in

the timing formulas become zero or negative, which in most cases is not acceptable or

meaningful. In these cases, the speed of the bus settings tA, tC and tF must be correctly

adjusted.

Note:

All external memory bus timings and SSC timings presented in the following tables are given

by design characterization and not fully tested in production.

23.8.18

Multiplexed bus

VDD = 5V ±10%, VSS = 0V, TA = -40 to +125°C, CL = 50pF,

ALE cycle time = 6 TCL + 2tA + tC + tF (75ns at 40 MHz CPU clock without wait states).

Table 104. Multiplexed bus

Symbol

Parameter

fCPU = 40 MHz

TCL = 12.5ns

Variable CPU clock

1/2 TCL = 1 to 64 MHz

Min.

Max.

Min.

Max.

CC ALE high time

4 + tA

TCL - 8.5 + tA

CC Address setup to ALE

1.5 + tA

TCL - 11 + tA

CC Address hold after ALE

4 + tA

TCL - 8.5 + tA

ALE falling edge to RD, WR

(with RW-delay)

4 + tA

TCL - 8.5 + tA

ALE falling edge to RD, WR

(no RW-delay)

- 8.5 + tA

t10

Address float after RD, WR

(with RW-delay)(1)

6ns

t11

Address float after RD, WR

(no RW-delay)(1)

18.5

TCL + 6

t12

RD, WR low time

(with RW-delay)

15.5 + tC

2TCL - 9.5 + tC

t13

RD, WR low time

(no RW-delay)

28 + tC

3TCL - 9.5 + tC

t14

RD to valid data in

(with RW-delay)

6 + tC

2TCL - 19 + tC

t15

RD to valid data in

(no RW-delay)

18.5 + tC

3TCL - 19 + tC

t16

SR ALE low to valid data in

17.5 + tA + tC

3TCL - 20 + tA + tC

t17

Address/Unlatched CS to

valid data in

20 + 2tA + tC

4TCL - 30 + 2tA + tC ns

t18

Data hold after RD

rising edge

t19

SR Data float after RD

-16.5 + tF

2TCL - 8.5 + tF

ST10F276E bảng dữ liệu(PDF) 208 Page - STMicroelectronics

ST10F276E bảng dữ liệu(HTML) 208 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL