IS46LR16640C datasheet(4/47 Pages) ISSI

4 / 47 page

Rev. 0A | October 2022

www.issi.com - dram@issi.com

IS43/46LR32320C

IS43/46LR16640C

Table 2 : Pin Descriptions

Symbol

Type

Function

Descriptions

CK, /CK

Input

System Clock

The system clock input. CK and /CK are differential clock

inputs. All address and control input signals are registered on

the crossing of the rising edge of CK and falling edge of /CK.

Input and output data is referenced to the crossing of CK and

/CK.

CKE

Input

Clock Enable

CKE is clock enable controls input. CKE HIGH activates, and

CKE LOW deactivates internal clock signals, and device input

buffers and output drivers. CKE is synchronous for all functions

except for SELF REFRESH EXIT, which is achieved

asynchronously.

/CS

Input

Chip Select

/CS enables (registered Low) and disables (registered High)

the command decoder. All commands are masked when /CS

IS REGISTERED high. /CS provides for external bank selection

on systems with multiple banks. /CS is considered part of the

command code.

BA0, BA1

Input

Bank Address

BA0 and BA1 define to which bank an ACTIVE, READ, WRITE,

or PRECHARGE command is being applied. BA0 and BA1 also

determine which mode register (standard mode register or

extended mode register) is loaded during a LOAD MODE

A0~A13 (x16)

A0~A12 (x32)

Input

Address

Row Address

: RA0~RA13 (x16)

RA0~RA12 (x32)

Column Address

: CA0~CA9

Auto Precharge

: A10

/RAS, /CAS, /WE

Input

Row Address Strobe,

Column Address Strobe,

Write Enable

/RAS, /CAS and /WE define the operation.

Refer function truth table for details.

LDM, UDM

(x16)

DM0~DM3

(x32)

Input

Data Input Mask

DM is an input mask signal for write data. Input data

is masked when DM is sampled HIGH along with that input

data during a WRITE access. DM is sampled on both edges of

DQS. Although DM balls are input-only.

DQ0~DQ15 (x16)

DQ0~DQ31 (x32)

In/Output

Data Input/Output

Data input/output pin.

LDQS, UDQS

(x16)

DQS0~DQS3

(x32)

In/Output

Data Input/Output

Strobe

Output with read data, input with write data. DQS is edge-

aligned with read data, centered in write data. Data strobe is

used to capture data.

VDD

Supply

Power Supply

Power supply

VSS

Supply

Ground

VDDQ

Supply

DQ Power Supply

Power supply for DQ

VSSQ

Supply

DQ Ground

Ground for DQ

No Connection

No connection.

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