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PDF CBTW28DD14 Data sheet ( Hoja de datos )
| Número de pieza | CBTW28DD14 | |
| Descripción | 14-bit Bus Switch/multiplexer | |
| Fabricantes | NXP Semiconductors | |
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CBTW28DD14
14-bit bus switch/multiplexer for DDR2-DDR3 applications
Rev. 1 — 20 July 2010
Product data sheet
1. General description
This 14-bit bus switch/multiplexer (MUX) is designed for 1.5 V or 1.8 V supply voltage
operation, SSTL_15 or SSTL_18 signaling and CMOS select input levels. It is designed
for operation in DDR2 or DDR3 memory bus systems, with speeds up to 1600 MT/s.
The CBTW28DD14 has a 1 : 2 switch or 2 : 1 multiplex topology and offers a 14-bit wide
bus. Each 14-bit wide A-port can be switched to one of two ports B and C, for all bits
simultaneously. The selection of the port is by a simple CMOS input (SELect). Another
CMOS input (ENable) is available to allow all ports to be disconnected. Each port is
non-directional due to the use of FET switches, allowing a multitude of applications
requiring high-bandwidth switching or multiplexing.
The device is able to operate transparently in 1.5 V as well as 1.8 V applications. Typical
usage is SSTL_15 signaling when using a supply voltage of 1.5 V, and SSTL_18 signaling
when using a supply voltage of 1.8 V. The SEL and EN input signals are designed to
operate transparently as CMOS input level signals in both 1.5 V and 1.8 V supply voltage
conditions.
CBTW28DD14 uses NXP’s proprietary high-speed switch architecture providing high
bandwidth, very little insertion loss at low frequency, and very low propagation delay,
allowing use in many applications requiring switching or multiplexing of high-speed
signals. It is available in a 4.5 mm × 4.5 mm TFBGA48 package with 0.5 mm ball pitch, for
optimal size versus board layout density considerations. It is characterized for operation
from −10 °C to +85 °C.
2. Features and benefits
2.1 Topology
14-bit bus width
1 : 2 switch/MUX topology
Bidirectional operation
Simple CMOS select pin (SEL)
Simple CMOS enable pin (EN)
2.2 Performance
1600 MT/s throughput
2.5 GHz bandwidth
Low ON insertion loss
Low crosstalk
High OFF isolation
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NXP Semiconductors
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CBTW28DD14
14-bit bus switch/multiplexer for DDR2-DDR3 applications
10. Static characteristics
Table 6. Static characteristics
VDD = 1.4 V to 2.0 V; Tamb = −10 °C to +85 °C; unless otherwise specified.
Symbol Parameter
Conditions
IDD supply current
EN = HIGH; VDD = 1.8 V
EN = LOW; VDD = 1.8 V
IIH HIGH-level input current VDD = 2.0 V; VI = VDD
IIL LOW-level input current VDD = 2.0 V; VI = GND
VIH HIGH-level input voltage SEL, EN pins
VIL LOW-level input voltage SEL, EN pins
VIK
input clamping voltage
VDD = 2.0 V; II = −18 mA
[1] Typical values are at VDD = 1.8 V, Tamb = 25 °C, and maximum loading.
11. Dynamic characteristics
Min
-
-
-
-
0.8VDD
-0.5
-
Typ[1]
0.3
-
-
-
-
-
−0.7
Max
1
10
±5
±5
-
0.2VDD
−1.2
Unit
mA
μA
μA
μA
V
V
V
Table 7.
Symbol
tstartup
trcfg
VI
Vbias(DC)
αil
RLin
αct
B
tPD
tsk
Dynamic characteristics
Parameter
Conditions
start-up time
supply voltage valid or EN going HIGH to
channel specified operating characteristics
reconfiguration time
SEL state change to channel specified
operating characteristics
input voltage
bias voltage (DC)
insertion loss
channel is on; 0 Hz ≤ f ≤ 1.0 GHz
channel is on; f = 2.5 GHz
channel is off; 0 Hz ≤ f ≤ 3.0 GHz
input return loss
channel is on; 0 Hz ≤ f ≤ 1.0 GHz
crosstalk attenuation
adjacent channels are on;
0 Hz ≤ f ≤ 1.0 GHz
bandwidth
−3.0 dB intercept
propagation delay
from A port to B port or C port or vice versa
skew time
from any output to any output
Min Typ Max
--1
Unit
ms
--1
ms
−0.3 -
VDD + 0.3 V
0-
2.0
V
−2.5 −1.5 -
dB
−4.5 -
-
dB
- - −20 dB
- - −10 dB
- - −25 dB
- 2.5 -
- 80 -
- - 20
GHz
ps
ps
CBTW28DD14
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 20 July 2010
© NXP B.V. 2010. All rights reserved.
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CBTW28DD14
14-bit bus switch/multiplexer for DDR2-DDR3 applications
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors product is automotive qualified,
the product is not suitable for automotive use. It is neither qualified nor tested
in accordance with automotive testing or application requirements. NXP
Semiconductors accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
product for such automotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, damages or failed product claims resulting from customer design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
16.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
17. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
CBTW28DD14
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 20 July 2010
© NXP B.V. 2010. All rights reserved.
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