AM28F256A_95 查看數據表（PDF） - Advanced Micro Devices
零件编号
产品描述 (功能)
生产厂家
AM28F256A_95
Advanced Micro Devices
AM28F256A_95 Datasheet PDF : 34 Pages
| |||
AMD
FUNCTIONAL DESCRIPTION
Description of User Modes
Table 1. Am28F256A User Bus Operations (Notes 7 and 8)
Operation
VPP
CE (E) OE (G) WE (W) (Note 1) A0
A9
I/O
Read-Only
Read
Standby
Output Disable
Auto-select Manufacturer
Code (Note 2)
VIL
VIL
X
VPPL
A0
A9
DOUT
VIH
X
X
VPPL
X
X
HIGH Z
VIL
VIH
VIH
VPPL
X
X
HIGH Z
VIL
VIL
VIH
VPPL
VIL
VID
CODE
(Note 3) (01H)
Auto-select Device Code
(Note 2)
VIL
VIL
VIH
VPPL
VIH
VID
CODE
(Note 3) (2FH)
Read
VIL
VIL
VIH
VPPH
A0
A9
DOUT
(Note 4)
Read/Write
Standby (Note 5)
Output Disable
Write
VIH
X
X
VPPH
X
X
HIGH Z
VIL
VIH
VIH
VPPH
X
X
HIGH Z
VIL
VIH
VIL
VPPH
A0
A9
DIN
(Note 6)
Legend:
X = Don’t care, where Don’t Care is either VIL or VIH levels. VPPL = VPP ≤ VCC + 2 V. See DC Characteristics for voltage
levels of VPPH. 0 V < An < VCC + 2 V, (normal TTL or CMOS input levels, where n = 0 or 9).
Notes:
1. VPPL may be grounded, connected with a resistor to ground, or ≤ VCC +2.0 V. VPPH is the programming voltage specified
for the device. Refer to the DC characteristics. When VPP = VPPL, memory contents can be read but not written or erased.
2. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 2.
3. 11.5 ≤ VID ≤ 13.0 V. Minimum VID rise time and fall time (between 0 and VID voltages) is 500 ns.
4. Read operation with VPP = VPPH may access array data or the Auto select codes.
5. With VPP at high voltage, the standby current is ICC + IPP (standby).
6. Refer to Table 3 for valid DIN during a write operation.
7. All inputs are Don’t Care unless otherwise stated, where Don’t Care is either VIL or VIH levels. In the Auto select mode all
addresses except A9 and A0 must be held at VIL.
8. If VCC ≤ 1.0 Volt, the voltage difference between VPP and VCC should not exceed 10.0 Volts. Also, the Am28F256A has a VPP
rise time and fall time specification of 500 ns minimum.
2-42
Am28F256A
Share Link: