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DD4C16_32x64A.fm - Rev. E 11/08 EN
1 ©2003 Micron Technology, Inc. All rights reserved.
128MB, 256MB (x64, SR) 184-Pin DDR SDRAM UDIMM
Features
DDR SDRAM UDIMM
MT4VDDT1664A – 128MB
MT4VDDT3264A – 256MB
For component data sheets, refer to Micron’s Web site: www.micron.com
Features
• 184-pin, unbuffered dual in-line memory module
(UDIMM)
• Fast data transfer rates: PC2100, PC2700, or PC3200
• 128MB (16 Meg x 64) or 256MB (32 Meg x 64)
• Vdd = Vddq = +2.5V
(-40B: Vdd = Vddq = +2.6V)
• VddSPD = +2.3V to +3.6V
• 2.5V I/O (SSTL_2-compatible)
• Internal, pipelined, 2n-prefetch double data rate
(DDR) architecture
• Bidirectional data strobe (DQS) transmitted/
received with data—that is, source-synchronous
data capture
• Differential clock inputs (CK and CK#)
• Multiple internal device banks for concurrent
operation
• Single rank
• Selectable burst lengths (BL): 2, 4, or 8
• Auto precharge option
• Auto refresh and self refresh modes: 7.8125µs
maximum average periodic refresh interval
• Serial presence-detect (SPD) with EEPROM
• Selectable CAS latency (CL) for maximum
compatibility
• Gold edge contacts
Figure 1: 184-Pin UDIMM (MO-206)
Notes: 1. Contact Micron for industrial temperature
module offerings.
Options Marking
• Operating temperature
1
– Commercial (0°C ≤ T
A
≤ +70°C) None
– Industrial (–40°C ≤ T
A
≤ +85°C) I
•Package
– 184-pin DIMM (standard) G
– 184-pin DIMM (Pb-free) Y
• Memory clock, speed, CAS latency
– 5.0ns (200 MHz), 400 MT/s, CL = 3 -40B
– 6.0ns (167 MHz), 333 MT/s, CL = 2.5 -335
– 7.5ns (133 MHz), 266 MT/s, CL = 2
1
-262
– 7.5ns (133 MHz), 266 MT/s, CL = 2
1
-26A
– 7.5ns (133 MHz), 266 MT/s, CL = 2.5
1
-265
PCB height: 31.75mm (1.25in)
Notes: 1. The values of
t
RCD and
t
RP for -335 modules show 18ns to align with industry specifications;
actual DDR SDRAM device specifications are 15ns.
Table 1: Key Timing Parameters
Speed
Grade
Industry
Nomenclature
Data Rate (MT/s)
t
RCD
(ns)
t
RP
(ns)
t
RC
(ns) NotesCL = 3 CL = 2.5 CL = 2
-40B PC3200 400 333 266 15 15 55
-335 PC2700 – 333 266 18 18 60 1
-262 PC2100 – 266 200 20 20 65
-26A PC2100 – 266 200 20 20 65
-265 PC2100 – 266 200 20 20 65