AM29F040-120JC AMD (ADVANCED MICRO DEVICES), AM29F040-120JC Datasheet - Page 7

• Manufacturer Part Number: AM29F040-120JC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM29F040-120JC

• Lead Free Status / Rohs Status: Not Compliant

Legend:
L = Logic 0, H = Logic 1, X = Don’t Care. See DC Characteristics for voltage levels.
Notes:
1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Tables 2 and 4.
2. Refer to Table 3 for valid PD (Program Data) during a write operation.
3. Refer to the section on Sector Protection.
4. WE can be V
Read Mode
The Am29F040 has two control functions which must
be satisfied in order to obtain data at the outputs. CE is
the power control and should be used for device selec-
tion. OE is the output control and should be used to
gate data to the output pins if a device is selected.
Address access time (t
stable addresses to valid output data. The chip enable
access time (t
stable CE to valid data at the output pins. The output en-
able access time is the delay from the falling edge of OE
to valid data at the output pins (assuming the addresses
have been stable for at least t
Standby Mode
The Am29F040 has two standby modes, a CMOS
standby mode (CE input held at V
current consumed is less than 5 A; and a TTL standby
mode (CE is held at V
reduced to approximately 1 mA. In the standby mode
the outputs are in a high impedance state, independent
of the OE input.
If the device is deselected during erasure or program-
ming, the device will draw active current until the
operation is completed.
Autoselect Manufacturer Code (Note 1)
Autoselect Device Code (Note 1)
Read (Note 4)
Standby
Output Disable
Write
Verify Sector Protect (Note 3)
Autoselect Device Unprotect Code
CE
IL
) is the delay from stable addresses and
Operation
if OE is V
IH
ACC
) when the current required is
IL
) is equal to the delay from
, OE at V
ACC
–t
CC
OE
Table 1. Am29F040 User Bus Operations
IH
initiates the write operations.
time).
0.5 V), when the
CE
H
L
L
L
L
L
L
L
Am29F040
OE
X
H
H
L
L
L
L
L
Output Disable
With the OE input at a logic high level (V
the device is disabled. This will cause the output pins to
be in a high impedance state.
Autoselect
The autoselect mode allows the reading out of a binary
code from the device and will identify its manufacturer
and type. This mode is intended for use by programming
equipment for the purpose of automatically matching the
device to be programmed with its corresponding pro-
gramming algorithm. This mode is functional over the
entire temperature range of the device.
To activate this mode, the programming equipment
must force V
Two identifier bytes may then be sequenced from the
device outputs by toggling address A0 from V
All addresses are don’t cares except A0, A1, and A6.
The manufacturer and device codes may also be read
via the command register, for instances when the
Am29F040 is erased or programmed in a system with-
out access to high voltage on the A9 pin. The command
sequence is illustrated in Table 4 (refer to Autoselect
Command section).
Byte 0 (A0 = V
(AMD = 01H) and byte 1 (A0 = V
code (Am29F040 = A4H). All identifiers for manufac-
turer and device exhibit odd parity with the MSB (DQ7)
defined as the parity bit. See Table 2.
WE
H
H
X
H
H
H
L
H
A0
A0
A0
X
H
X
H
L
L
ID
IL
(11.5 V to 12.5 V) on address pin A9.
) represents the manufacturer’s code
A1
A1
A1
X
X
H
H
L
L
A6
A6
A6
X
X
L
L
L
L
IH
) the device identifier
A9
V
V
V
V
A9
A9
X
X
ID
ID
ID
ID
IH
), output from
PD (Note 2)
HIGH Z
HIGH Z
Code
Code
Code
Code
IL
I/O
RD
to V
IH
7
.