X24640 Datasheet, PDF (2/17 Pages) Xicor Inc. – 400KHz 2-Wire Serial E 2 PROM with Block Lock

X24640
Xicor E²PROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data
retention is greater than 100 years.
PIN DESCRIPTIONS
Serial Clock (SCL)
The SCL input is used to clock all data into and out of
the device.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into
and out of the device. It is an open drain output and
may be wire-ORed with any number of open drain or
open collector outputs.
An open drain output requires the use of a pull-up
resistor. For selecting typical values, refer to the Pull-
up resistor selection graph at the end of this data
sheet.
Device Select (S₀, S₁, S₂)
The device select inputs (S₀, S₁, S₂) are used to set
the first three bits of the 8-bit slave address. This
allows up to eight devices to share a common bus.
These inputs can be static or actively driven. If used
statically they must be tied to V_SS or V_CC as appro-
priate. If actively driven, they must be driven with
CMOS levels (driven to V_CC or V_SS).
Write Protect (WP)
The Write Protect input controls the Hardware Write
Protect feature. When held LOW, Hardware Write
Protection is disabled. When this input is held HIGH,
and the WPEN bit in the Write Protect Register is set
HIGH, the Write Protect Register is protected,
preventing changes to the Block Lock Protection and
WPEN bits.
PIN NAMES
Symbol
S₀, S₁, S₂
SDA
SCL
WP
V_SS
V_CC
NC
PIN CONFIGURATION
Description
Device Select Inputs
Serial Data
Serial Clock
Write Protect
Ground
Supply Voltage
No Connect
7038 FM T01
Not to scale
8-Lead PDIP/SOIC
* .197”
S0
S1
S2
VSS
1
8
2
7
X24640
3
6
4
5
VCC
WP
SCL
SDA
* .244”
0.300"
Max
NC
S₀
S₁
NC
NC
NC
S₂
VSS
NC
NC
20-Lead TSSOP
1
2200
2
1199
3
1188
4
1177
5
1166
6 ^X24640 1155
7
1144
8
1133
9
1122
10
111
NC
VCC
WP
NC
NC
NC
SCL
SDA
NC
NC
* SOIC Measurement
0.252"
7038 FM 02
2