Epson SED 1520 Series manual 33

SED1520 Series

• MPU Bus Read/Write II (68-family MPU)

t CYC6
E
	t EW
t r	t f
t AW6	t DS6
R/W
	t AH6
A0,CS
	t DH6
D0 to D7
(WRITE)
t ACC6	t OH6
D0 to D7
(READ)

Ta = –20 to 75 deg. C, VSS = –5 V±10 unless stated otherwise

Parameter		Symbol	Condition	Rating		Unit	Signal
				Min.	Max.
System cycle time		tCYC6		1000	—	ns
Address setup time		tAW6		20	—	ns	A0,	CS,	R/W
Address hold time		tAH6		10	—	ns
Data setup time		tDS6		80	—	ns
Data hold time		tDH6		10	—	ns	D0 to D7
Output disable time		tOH6	CL = 100 pF	10	60	ns
Access time		tACC6		—	90	ns
Enable	Read	tEW		100	—	ns		E
pulsewidth	Write			80	—	ns
Rise and fall time		tr, tf	—	—	15	ns		—

(VSS = –2.7 to – 4.5 V, Ta = –20 to +75°C)

Parameter		Symbol	Condition	Rating		Unit	Signal
				Min.	Max.
System cycle time*1		tCYC6	—	2000	—	ns
Address setup time		tAW6		40	—	ns	A0,
			—					CS,	R/W
Address hold time		tAH6		20	—	ns
Data setup time		tDS6	—	160	—	ns
Data hold time		tDH6		20	—	ns	D0 to D7
Output disable time		tOH6	CL = 100 pF	20	120	ns
Access time		tACC6		—	180	ns
Enable	Read	tEW	—	200	—	ns		E
pulse width	Write			160	—	ns
Rise and fall time		tr, tf	—	—	15	ns		—

Notes: 1. tCYC6 is the cycle time of CS. E = H, not the cycle time of E.

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