CAT28F020 CATALYST [Catalyst Semiconductor], CAT28F020 Datasheet - Page 13

• Manufacturer Part Number: CAT28F020
• Description: 2 Megabit CMOS Flash Memory
• Manufacturer: CATALYST [Catalyst Semiconductor]

Abort/Reset
An Abort/Reset command is available to allow the user
to safely abort an erase or program sequence. Two
consecutive program cycles with FFH on the data bus
will abort an erase or a program operation. The abort/
reset operation can interrupt at any time in a program or
erase operation and the device is reset to the Read
Mode.
POWER UP/DOWN PROTECTION
The CAT28F020 offers protection against inadvertent
programming during V
When powering up the device there is no power-on
sequencing necessary. In other words, V
may power up in any order. Additionally V
hardwired to V
any power up/down cycling. The internal command
register of the CAT28F020 is reset to the Read Mode on
power up.
Figure 8. Alternate A.C. Timing for Program Operation
ADDRESSES
DATA (I/O)
WE (W)
OE (G)
CE (E)
V CC POWER-UP
V CC
V PP
& STANDBY
5.0V
0V
V PPH
V PPL
PPH
t GHEL
HIGH-Z
independent of the state of V
SETUP PROGRAM
t DVEH
PP
COMMAND
t EHWH
and V
t VPEL
t WC
t EHEL
t WLEL
DATA IN
= 40H
t AVEL
CC
power transitions.
LATCH ADDRESS
& DATA
t EHDX
PP
PP
t WLEL
and V
t ELAX
DATA IN
may be
CC
PROGRAMMING
t DVEH
t ELEH
and
CC
t EHWH
t WLEL
13
t EHDX
t EHEH
POWER SUPPLY DECOUPLING
To reduce the effect of transient power supply voltage
spikes, it is good practice to use a 0.1 F ceramic
capacitor between V
high-frequency capacitors should be placed as close as
possible to the device for optimum decoupling.
t ELEH
t DVEH
PROGRAM
COMMAND
VERIFY
t WC
DATA IN
= C0H
t EHWH
t EHGL
CC
t EHDX
t OLZ
t OE
t LZ
t CE
and V
VERIFICATION
PROGRAM
SS
t RC
and V
DATA OUT
VALID
Doc. No. 25037-00 2/98 F-1
PP
V CC POWER-DOWN/
and V
CAT28F020
STANDBY
t EHQZ
t DF
t OH
SS
. These
28F020 F09