Cypress CY7C1245V18 Uživatelský manuál stáhnout pdf (Strana 17)

CY7C1241V18, CY7C1256V18

CY7C1243V18, CY7C1245V18

Document Number: 001-06365 Rev. *D Page 17 of 28

TAP AC Switching Characteristics

Over the Operating Range

[15, 16]

Parameter Description Min Max Unit

TCYC

TCK Clock Cycle Time 50 ns

TCK Clock Frequency 20 MHz

TCK Clock HIGH 20 ns

TCK Clock LOW 20 ns

Setup Times

TMSS

TMS Setup to TCK Clock Rise 5 ns

TDIS

TDI Setup to TCK Clock Rise 5 ns

Capture Setup to TCK Rise 5 ns

Hold Times

TMSH

TMS Hold after TCK Clock Rise 5 ns

TDIH

TDI Hold after Clock Rise 5 ns

Capture Hold after Clock Rise 5 ns

Output Times

TDOV

TCK Clock LOW to TDO Valid 10 ns

TDOX

TCK Clock LOW to TDO Invalid 0 ns

TAP Timing and Test Conditions

[16]

(a)

TDO

= 20 pF

= 50Ω

GND

0.9V

50Ω

1.8V

ALL INPUT PULSES

0.9V

Test Clock

Test Mode Select

TCK

TMS

Test Data In

TDI

Test Data Out

TCYC

TMSH

TMSS

TDIS

TDIH

TDOV

TDOX

TDO

Notes

15. t

and t

refer to the set-up and hold time requirements of latching data from the boundary scan register.

16. Test conditions are specified using the load in TAP AC test conditions. t

= 1 ns.

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