Industrial Temperature
16Mbit Enhanced Synchronous DRAM
1Mx16 ESDRAM
Preliminary Data Sheet
Pin Descriptions
Symbol
CLK
Type
Input
Input
Function
Clocks: All SDRAM input signals are sampled on the positive edge of CLK.
CKE
Clock Enable: CKE activates (high) or deactivates (low) the CLK signals. Deactivating the
clock initiates the Power-Down and Self-Refresh operations (all banks idle), or Clock
Suspend operation. CKE is synchronous until the device enters Power-Down and Self-
Refresh modes where it is asynchronous until the mode is exited.
/CS
Input
Input
Chip Select: /CS enables (low) or disables (high) the command decoder. When the
command decoder is disabled, new commands are ignored but previous operations
continue.
/RAS, /CAS,
/WE
Command Inputs: Sampled on the rising edge of CLK, combinations of these inputs define
the command to execute.
A11 (BS)
A0-A10
Input
Input
Selects bank to activate. A11 low selects Bank A and A11 high selects Bank B.
Address Inputs: A0-A10 define the row address during the Bank Activate command. A0-
A9 define the column address during Read and Write commands. A10/AP invokes the
auto-precharge operation. During manual Precharge commands, A10/AP low specifies a
single bank precharge while A10/AP high precharges all banks. The address inputs are
also used to program the Mode Register.
DQ0-DQ15
Input/
Data I/O: Data bus inputs and outputs. For Write cycles, input data is applied to these
pins and must be set-up and held relative to the rising edge of clock. For Read cycles, the
device drives output data on these pins after the CAS latency is satisfied.
Output
UDQM,
LDQM
Input
Data I/O Mask Inputs: DQM inputs mask write data (zero latency) and act as a
synchronous output enable (2-cycle latency) for read data.
VDD
Supply
Supply
Supply
-
Power Supply for the input buffers and core logic: +3.3 V
Power Supply for the output buffers: +3.3 V or +2.5V
Ground: VSS and VSSQ are connected inside the chip.
No connect - open pin.
VDDQ
VSS, VSSQ
NC
Enhanced Memory Systems Inc., 1850 Ramtron Dr., Colo Spgs, CO 80921
PHONE: (800) 545-DRAM; FAX: (719) 488-9095; http://www.edram.com
1999 Enhanced Memory Systems. All rights reserved.
The information contained herein is subject to change without notice.
Revision 1.0
Page 3 of 9
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
