DS8007 Просмотр технического описания (PDF) - Maxim Integrated

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DS8007

Multiprotocol Dual Smart Card Interface

Maxim Integrated 

Multiprotocol Dual Smart Card Interface

AC ELECTRICAL SPECIFICATIONS—TIMING PARAMETERS FOR CONSECUTIVE

READ/WRITE TO URR/UTR/TOC

(VDD = 3.3V, VDDA = 3.3V, TA = +25°C, unless otherwise noted.)

PARAMETER

SEE FIGURE 3

RD Pulse Width

RD Low to Bit CRED = 1

Set Time Bit FE

Set Time Bit RBF

SEE FIGURE 4

WR/CS Pulse Width

WR/CS Low to I/Ox Low

SEE FIGURE 5

WR/CS Pulse Width

WR/CS High to Bit CRED = 1

SYMBOL

CONDITIONS

tW(RD)

tRD(URR)

tSB(FE)

tSB(RBF)

tW(WR) (Note 4)

tWR(UTR)

tW(WR)

tWR(TOC) (Notes 4 and 5)

MIN

TYP MAX UNITS

10

tW(RD) +

2tCY(CLK)

10.5

10.5

tW(RD) +

3tCY(CLK)

ns

ns

ETU

ETU

10

tW(WR) +

2tCY(CLK)

ns

tW(WR) +

ns

3tCY(CLK)

10

1 / PSC

ns

2 / PSC ETU

Note 4: Depends on the leading edge of WR or CS (whichever is deasserted first). Reference this specification to the rising edge

of CS/WR instead of the falling edge.

Note 5: PSC is the programmed prescaler value (31 or 32).

I/Ox

RBF BIT

FE BIT

tSB(FE)

tSB(RBF)

INT

RD

tW(RD)

CRED BIT

tRD(URR)

Figure 3. Timing Between Two Read Operations in Register URR

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