IP4855CX25 NXP [NXP Semiconductors], IP4855CX25 Datasheet - Page 5

• Manufacturer Part Number: IP4855CX25
• Description: SD 3.0-compliant memory card integrated voltage level translator with EMI filter and ESD protection
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
8. Functional description
IP4855CX25
Product data sheet
8.1 Level translator
Table 3.
[1]
[2]
The bidirectional level translator shifts the data between the I/O supply levels of the host
and the memory card. Dedicated direction control signals determine if a command and
data signals are transferred from the memory card to the host (card read mode) or from
the host to the memory card (card write mode). The voltage translator has to support
several clock and data transfer rates at the signaling levels specified in the SD 3.0
standard specification.
Table 4.
Symbol
CLK_IN
ENABLE
GND
V
CLK_SD
DATA0_H
CMD_H
CD
CMD_SD
DATA0_SD
DATA1_H
CLK_FB
DIR_1_3
WP
DATA1_SD
Bus speed mode
Default-Speed
High-Speed
SDR12
SDR25
SDR50
DDR50
SD_REF
The pin names relate particularly to SD memory cards, but also apply to microSD and MMC memory cards.
I = input, O = output, I/O = input and output, S = power supply
[1]
Pin description
Supported modes
SD 3.0-compliant memory card integrated dual voltage level translator
Pin
C1
C2
C3
C4
C5
D1
D2
D3
D4
D5
E1
E2
E3
E4
E5
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 13 September 2012
Signal level (V)
3.3
3.3
1.8
1.8
1.8
1.8
Type
I
I
S
I
O
I/O
I/O
O
I/O
I/O
I/O
O
I
O
I/O
…continued
[2]
Description
clock signal input on host side
device enable input
supply ground
reference voltage for the internal voltage regulator
clock signal output on memory card side
data 0 input or output on host side
command input or output on host side
card detect switch biasing output
command input or output on memory card side
data 0 input or output on memory card side
data 1 input or output on host side
clock feedback output on host side
direction control input for data 1, data 2, data 3
write protect switch biasing output
data 1 input or output on memory card side
Clock rate (MHz)
25
50
25
50
100
50
IP4855CX25
Data rate (MB/s)
12.5
25
12.5
25
50
50
© NXP B.V. 2012. All rights reserved.
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