Transcend Information TS1~2GUSD-S3 manual Bus Timing

TS1~2GUSD-S3 microSD Memory Card + Reader S3

•Bus Timing

Parameter

Symbol

Min

Max.

Unit

Remark

Clock CLK (All values are referred to min (VIH) and max (VIL)

	Clock frequency Data Transfer Mode	fPP	0		25		MHz	CL ≤ 100 pF, (7 cards)
	Clock frequency Identification Mode	fOD	0		400		KHz	CL ≤ 250 pF, (21 cards)
	(The low freq. is required for MultiMediaCard
	compatibility.)
	Clock low time	tWL	10				ns	CL ≤ 100 pF, (7 cards)
			50				ns	CL ≤ 250 pF, (21 cards)
	Clock high time	tWH	10				ns	CL ≤ 100 pF, (7 cards)
			50				ns	CL ≤ 250 pF, (21 cards)
	Clock rise time	tTLH			10		ns	CL ≤ 100 pF, (7 cards)
					50		ns	CL ≤ 250 pF, (21 cards)
	Clock fall time	tTHL			10		ns	CL ≤ 100 pF, (7 cards)
					50		ns	CL ≤ 250 pF, (21 cards)
	Inputs CMD, DAT (referenced to CLK)
	Input set-up time	tISU	5				ns	CL ≤ 25 pF, (1 cards)
	Input hold time	tIH	5				ns	CL ≤ 25 pF, (1 cards)
	Outputs CMD, DAT (referenced to CLK)
	Output Delay time	tODLY		0		14	ns	CL ≤ 25 pF, (1 cards)
Transcend Information Inc.			5