Download datasheet for M378B5273CH0 by Samsung Electronics

Unbuffered DIMM

Rev. 1.2

DDR3 SDRAM

6. Pin Description

Pin Name

A0-A14

BA0-BA2

Description

SDRAM address bus

SDRAM bank select

RAS

CAS

WE

SDRAM row address strobe

SDRAM column address strobe

SDRAM write enable

S0, S1

CKE0,CKE1

DIMM Rank Select Lines

SDRAM clock enable lines

ODT0, ODT1 On-die termination control lines

DQ0 - DQ63

CB0 - CB7

DQS0 - DQS8

DQS0-DQS8

DM0-DM8

CK0, CK1

CK0, CK1

DIMM memory data bus

DIMM ECC check bits

SDRAM data strobes

(positive line of differential pair)

SDRAM differential data strobes

(negative line of differential pair)

SDRAM data masks/high data strobes

(x8-based x72 DIMMs)

SDRAM clocks

(positive line of differential pair)

SDRAM clocks

(negative line of differential pair)

NOTE :

* The V

DD

and V

DDQ pins are tied common to a single power-plane on these designs.

** DM8, DQS8 and DQS8 are for ECC UDIMM only.

Pin Name

SCL

SDA

SA0-SA2

V

DD

*

V

DDQ

*

V

REFDQ

V

REFCA

V

SS

V

DDSPD

NC

TEST

RESET

EVENT

V

TT

RFU

Description

I

2

C serial bus clock for EEPROM

I

2

C serial bus data line for EEPROM

I

2

C serial address select for EEPROM

SDRAM core power supply

SDRAM I/O Driver power supply

SDRAM I/O reference supply

SDRAM command/address reference supply

Power supply return (ground)

Serial EEPROM positive power supply

Spare Pins(no connect)

Used by memory bus analysis tools

(unused on memory DIMMs)

Set DRAMs Known State

Reserved for optional temperature-sensing hardware

SDRAM I/O termination supply

Reserved for future use

7. SPD and Thermal Sensor for ECC UDIMMs

On DIMM thermal sensor will provide DRAM temperature readout through a integrated thermal sensor.

EVENT

SCL

R1

0

Ω

R2

0

Ω

WP/EVENT

SA0 SA1

SA0 SA1

SA2

SA2

SDA

NOTE :

1. Raw Cards D (1Rx8 ECC) and E (2Rx8 ECC) support a thermal sensor.

2. When the SPD and the thermal sensor are placed on the module, R1 is placed but R2 is not.

When only the SPD is placed on the module, R2 is placed but R1 is not.

[ Table 1 ] Temperature Sensor Characteristics

Grade

B

Range

75 < Ta < 95

40 < Ta < 125

-20 < Ta < 125

Resolution

Min.

-

-

-

Temperature Sensor Accuracy

Typ. Max.

+/- 0.5

+/- 1.0

+/- 2.0

0.25

+/- 1.0

+/- 2.0

+/- 3.0

Units

°C

°C /LSB

NOTE

-

-

-

-

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