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ROM-1B Datasheet

It is often advisable to maintain separate analog and digital grounds throughout a complete system, tying them common m one place only. If the common tie-point is remote and accidental disconnection of that one common tie-point occurs due to card removal with power on, a large differential voltage between the
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ROM-1B on stock

(6) When designing your equipment, comply with the guaranteed values, in particular those of maximum rat- ing, the range of operating power supply voltage, and heat radiation characteristics. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.

			VARIABLE CLOCK
SYMBOL	FIGURE	PARAMETER	MIN	MAX	UNIT
External Clock
fc		Oscillator frequency	O	30	MHz
tc	26	Clock period and CPU timing cycle	1/fc		ns
LCHCX	26	Clock high time	tc+ 0.5 7		ns
tCLCX	26	Clock low time	tc+ 0.4 7		ns
tCLCH	26	Clock rise time		5	ns
tCHCL	26	Clock fall time		5	ns
Address Cycle
LCRAR	25	Delay from clock rising edge to ALE rising edge	5	46	ns
tLHLL	20	ALE pulse width (programmable)	(V1+ tc) -6		ns
tAVLL	20	Address valid to ALE de-asserted (set-up)	(V1+ tc) - 14		ns
tLLAX	20	Address hold after ALE de-asserted	(tc/2) - 10		ns
Code Read Cycle
tPLPH	20	PSEN pulse width	(V2+ tc) - 10		ns
tLLPL	20	ALE de-asserted to PSEN asserted	(tc/2) -7		ns
LAV JVA	20	Address valid to instruction valid, ALE cycle (access time)		(V3+ tc) - 36	ns
LAVlVB	21	Address valid to instruction valid, non-ALE cycle (access time)		(V4+ tc) - 29	ns
tPLIV	20	PSEN asserted to instruction valid (enable time)		(V2+ tc) - 29	ns
tPXIX	20	Instruction hold after PSEN de-asserted	O		ns
tPXIZ	20	Bus 3-State after PSEN de-asserted (disable time)		tc -8	ns
LlXUA	20	Hold time of unlatched part of address after instruction latched	O		ns
Data Read Cycle
LRLRH	22	RD pulse width	(V7+ tc) - 10		ns
tLLRL	22	ALE de-asserted to RD asserted	(tc/2) -7		ns
LAvDA	22	Address valid to data input valid, ALE cycle (access time)		(V6+ tc) - 36	ns
LAVDVB	23	Address valid to data input valid, non-ALE cycle (access time)		(V5+ tc) - 29	ns
LRLDV	22	RD low to valid data in, enable time		(V7' tc) - 29	ns
LRHDX	22	Data hold time after RD de-asserted	O		ns
LRHDZ	22	Bus 3-State after RD de-asserted (disable time)		tc -8	ns
LDXUA	22	Hold time of unlatched part of address after data latched	O		ns
Data Write Cycle
LWLwH	24	WR pulse width	(V8+ tc) - 10		ns
tLLWL	24	ALE falling edge to WR asserted	(V12 * tc) - 10		ns
LQVWX	24	Data valid before WR asserted (data setup time)	(V13 * tc) - 22		ns
LWHOX	24	Data hold time after WR de-asserted (Note 6)	(V11+ tc) -7		ns
LAvWL	24	Address valid to WR asserted (address setup time) (Note 5)	(V9+ tc) - 22		ns
LUAWH	24	Hold time of unlatched part of address after WR is de-asserted	(V11+ tc) -7		ns
Wait Input
tWTH	25	WAIT stable after bus strobe (RD, WR, or PSEN) asserted		(V10 * tc) - 30	ns
tWTL	25	WAIT hold after bus strobe (RD, WR, or PSEN) assertion	(V10' tc) -5		ns

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