PD46184095B_15 Datasheet, PDF (6/34 Pages) Renesas Technology Corp – 18M-BIT DDR II SRAM SEPARATE I/O 2-WORD BURST OPERATION

μPD46184095B, μPD46184185B
Symbol
Type
CQ, CQ# Output
ZQ
Input
DLL#
Input
TMS
TDI
TCK
TDO
VREF
VDD
VDDQ
VSS
NC
Input
Input
Output
−
Supply
Supply
Supply
−
(2/2)
Description
Synchronous Echo Clock Outputs. The rising edges of these outputs are tightly matched to
the synchronous data outputs and can be used as a data valid indication. These signals run
freely and do not stop when Q tristates. If C and C# are stopped (if K and K# are stopped in
the single clock mode), CQ and CQ# will also stop.
Output Impedance Matching Input: This input is used to tune the device outputs to the
system data bus impedance. Q, CQ and CQ# output impedance are set to 0.2 x RQ, where
RQ is a resistor from this bump to ground. The output impedance can be minimized by
directly connect ZQ to VDDQ. This pin cannot be connected directly to GND or left
unconnected. The output impedance is adjusted every 20 μs upon power-up to account for
drifts in supply voltage and temperature. After replacement for a resistor, the new output
impedance is reset by implementing power-on sequence.
PLL Disable: When debugging the system or board, the operation can be performed at a
clock frequency slower than TKHKH (MAX.) without the PLL circuit being used, if DLL# =
LOW. The AC/DC characteristics cannot be guaranteed. For normal operation, DLL# must
be HIGH and it can be connected to VDDQ through a 10 kΩ or less resistor.
IEEE 1149.1 Test Inputs: 1.8 V I/O level. These balls may be left Not Connected if the
JTAG function is not used in the circuit.
IEEE 1149.1 Clock Input: 1.8 V I/O level. This pin must be tied to VSS if the JTAG function
is not used in the circuit.
IEEE 1149.1 Test Output: 1.8 V I/O level.
When providing any external voltage to TDO signal, it is recommended to pull up to VDD.
HSTL Input Reference Voltage: Nominally VDDQ/2. Provides a reference voltage for the
input buffers.
Power Supply: 1.8 V nominal. See Recommended DC Operating Conditions and DC
Characteristics for range.
Power Supply: Isolated Output Buffer Supply. Nominally 1.5 V. 1.8 V is also permissible.
See Recommended DC Operating Conditions and DC Characteristics for range.
Power Supply: Ground
No Connect: These signals are not connected internally.
R10DS0115EJ0200 Rev.2.00
Nov 09, 2012
Page 6 of 34