X88064 Datasheet, PDF (1/15 Pages) Xicor Inc. – E2 Micro-Peripheral

APPLICATION NOTE
A V A I LABLE
Application Brief
iAPX88/188, MCS 196, MCS51 Compatible*
64K
X88064
8192 x 8 Bit
E² Microcontroller Peripheral
• Block Lock Write Control
—Eight 1K Byte Blocks
- Lockable Independently or in Combination
• Multiplexed Address/Data Bus
—Direct Interface to Popular Microcontrollers
• High Performance CMOS
—Fast Access Times, 60ns and 80 ns
—Low Power
- 30mA Active Maximum
- 150µA Standby Maximum
• Software Data Protection
• Toggle Bit Polling
—Early End of Write Detection
• Page Mode Write
—Allows up to 32 Bytes to be Written in
One Write Cycle
DESCRIPTION
The X88064 is a high speed byte wide microperipheral
device with eight 1K byte blocks of E²PROM and can be
directly connected to industry standard high performance
microprocessors. This peripheral provides two levels of
memory write control, the standard Software Data Pro-
gram (SDP) control and Block Lock.
Block Lock provides a higher level of memory write con-
trol above SDP. This allows the software developer to
partition any or all of the eight 1K byte blocks as In-Circuit
Programmable ROM (ICPROM). Once locked, a block of
memory must first be unlocked before being written. Not
even a write operation using the SDP sequence will
change the contents of a locked block. Since a distinct, 6
byte, software command sequence locks and unlocks
the memory, the software developer has complete con-
trol of the memory contents.
ALE
A/D₀–A/D₇
L
A
A₈–A₁₂
T
C
H
WR
RD
PSEN
CE
WC
INTERFACE
CONTROL
BLOCK LOCK
CONTROL
LOGIC
D
E
C
O
D
E
R
INDIVIDUALLY LOCKABLE
E² PROM
ARRAY
1Kx8 BLOCKS
SOFTWARE DATA PROTECT
(SDP)
WE
OE
BUS TRANSCEIVER
POWER-ON RESET
AND V_CC SENSE
A/D₀–A/D₇
©Xicor, Inc. 1994, 1995, 1996 Patents Pending
* All other brand and product names may be trademarks or
1
registered trademarks of their respective companies.
7023-2.3 1/29/97 T0/C2/D0 SH
Characteristics subject to change without notice