T2316405A Datasheet, PDF (1/14 Pages) Taiwan Memory Technology – 4M x 4 DYNAMIC RAM EDO PAGE MODE

tm TE
CH
DRAM
FEATURES
• Industry-standard x 4 pinouts and timing
functions
• power supply : T2316405A 2.6V(±0.2V)
T2316407A 3.3V(±0.3V)
• All device pins are TTL- compatible.
• 2048-cycle refresh in 32 ms.
• Refresh modes: RAS only, CAS BEFORE
RAS (CBR) and HIDDEN.
• Extended data-out (EDO) PAGE MODE
access cycle.
OPTION
TIMING
50ns (For T2316407A only)
60ns (For T2316407A only)
70ns (For T2316407A only)
100ns (For T2316405A only)
MARKING
-50
-60
-70
-10
PACKAGE
26/24-pin SOJ
J
26/24-pin TSOP-II S
PIN ARRANGEMENT (Top View)
Vcc 1
I/O1 2
I/O2 3
WE 4
RAS 5
NC 6
A10 8
A0 9
A1 10
A2 11
A3 12
Vcc 13
SOJ
&
TSOP-II
26 Vss
25 I/O4
24 I/O3
23 CAS
22 OE
21 A9
19 A8
18 A7
17 A6
16 A5
15 A4
14 Vss
T2316405A
Preliminary T2316407A
4M x 4 DYNAMIC RAM
EDO PAGE MODE
GRNERAL DESCRIPTION
The T2316405A and T2316407A is a randomly
accessed solid state memory containing 16,777,216
bits organized in a x 4 configuration. It offers Fast
Page mode with Extended Data Output (EDO).
During READ or WRITE cycles, each of the 4
memory bits (1 bit per I/O) is uniquely addressed
through the 22 address bits, which are entered 11
bits (A0-A10) at a time. RAS latches the first 11
bits and CAS latches the latter 11 bits.
A READ or WRITE cycle is selected with
the WE input. A logic HIGH on WE dictates
READ mode while a logic LOW on WE dictates
WRITE mode. During a WRITE cycle, data -in is
latched by the falling edge of WE or CAS ,
whichever occurs last. When WE goes Low prior
to CAS going LOW ( EARLY WRITE cycle), the
output pins remain open (High-Z) until the next
CAS cycle.
A Late Write or Read-Modify-Write occurs.
When WE falls after CAS was taken LOW (Late
Write cycle). OE must be taken HIGH to disable
the data-outputs prior to applying input data.
The four data inputs and four data outputs are
routed through four pins using common I/O, and pin
direction is controlled by WE and OE .
Taiwan Memory Technology, Inc. reserves the right P. 1
to change products or specifications without notice.
Publication Date: APR 2001
Revision:0.B