|Category||Logic => Memory Interface|
|Description||SSTL16877; 14-bit SSTL_2 Registered Driver With Differential Clock Inputs;; Package: SOT362-1 (TSSOP48)|
|Company||Philips Semiconductors (Acquired by NXP)|
|Datasheet||Download SSTL16877 datasheet
14-bit SSTL_2 registered driver with differential clock inputs
Stub-series terminated logic for 2.5 V VDDQ (SSTL_2) Optimized for DDR (Double Data Rate) SDRAM applications Supports SSTL_2 signal inputs and outputs Flow-through architecture optimizes PCB layout Meets SSTL_2 class I and class II specifications Latch-up protection exceeds 500mA per JEDEC Std 17 ESD protection exceeds 2500 V per MIL STD 833 Method 3015
Q1 Q2 GND VDDQ Q4 Q5 GND VDDQ D2 46 GND 45 VCC D7 39 CLK 38 CLK+ 37 VCC 36 GND 35 VREF 34 RESET D12 28 VCC 27 GND 25 D14Full DDR1 PC333 solution 2.5 V when used with PCKV857 Mixed V (PC333) solution when used with
The 14-bit SSTL_2 registered driver with differential clock inputs, designed to operate between 2.3 V and 2.7 V. VDDQ must not exceed VCC. Inputs are SSTL_2 type with VREF normally at 0.5*VDDQ. The outputs support class I which can be used for standard stub-series applications or capacitive loads. Master reset (RESET) asynchronously resets all registers to zero. The SSTL16877 is intended to be incorporated into standard DIMM (Dual In-Line Memory Module) designs defined by JEDEC, such as DDR (Double Data Rate) SDRAM or SDRAM II Memory Modules. Different from traditional SDRAM, DDR SDRAM transfers data on both clock edges (rising and falling), thus doubling the peak bus bandwidth. A DDR DRAM rated at 166 MHz will have a burst rate of 333 MHz. The modules require between 23 and 27 registered control and address lines, so two 14-bit wide devices will be used on each module. The SSTL16877 is intended to be used for SSTL_2 input and output signals. The device data inputs consist of differential receivers. One differential input is tied to the input pin while the other is tied to a reference input pad, which is shared by all inputs. The clock input is fully differential to be compatible with DRAM devices that are installed on the DIMM. However, since the control inputs to the SDRAM change at only half the data rate, the device must only change state on the positive transition of the CLK signal. In order to be able to provide defined outputs from the device even before a stable clock has been supplied, the device must support an asynchronous input pin (reset), which when held to the LOW state will assume that all registers are reset to the LOW state and all outputs drive a LOW signal as well.
GND 0 V; Tamb 25°C; tr =tf v2.5 ns SYMBOL tPHL/tPLH CI PARAMETER Propagation delay; CLK to Qn Input capacitance CONDITIONS = 30 pF; VDDQ 2.5 V VCC 2.5 V TYPICAL 2.4 2.9 UNIT ns pF
NOTES: 1. CPD is used to determine the dynamic power dissipation (PD in µW) PD = CPD fi ) (CL VCC2 fo) where: fi = input frequency in MHz; CL = output load capacity in pF; fo = output frequency in MHz; VCC = supply voltage in V; (CL VCC2 fo) = sum of the outputs.
PACKAGES 48-Pin Plastic TSSOP Type I TEMPERATURE RANGE to +70°C ORDER CODE SSTL16877 DGG DWG NUMBER SOT362-1
SSTL_2 data outputs SSTL_2 input reference level Ground (0 V) Positive supply voltage Output supply voltage Differential clock inputs
H = High voltage level L = High voltage level = High-to-Low transition = Low-to-High transition X = Don't care
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